Removing retail mode - Nexus 9 Q&A, Help & Troubleshooting

Just a quick question in case anyone knows:
At my place of work we have an old nexus 9 that's in pretty much perfect condition, but it was originally used in demo mode to for the display and as such, has been stuck in demo mode since coming off display.
One of the technicians claims he had a go at removing the demo mode a couple of months ago but with no success, I presume he tried at least a factory reset on it.
I'm not sure exactly what methods he tried but I was wondering if anyone here happened to know if this was possible?
It's basically sitting in a corner unused so worth a crack.

M1kesky said:
Just a quick question in case anyone knows:
At my place of work we have an old nexus 9 that's in pretty much perfect condition, but it was originally used in demo mode to for the display and as such, has been stuck in demo mode since coming off display.
One of the technicians claims he had a go at removing the demo mode a couple of months ago but with no success, I presume he tried at least a factory reset on it.
I'm not sure exactly what methods he tried but I was wondering if anyone here happened to know if this was possible?
It's basically sitting in a corner unused so worth a crack.
Click to expand...
Click to collapse
Is demo mode enabled in the system UI tuner under settings?

I would suggest flashing the latest factory images in fastboot.

cam30era said:
I would suggest flashing the latest factory images in fastboot.
Click to expand...
Click to collapse
Would be a great idea, except I'm not sure you can get into Developer Options to enable Allow OEM Unlock while in Demo Mode, which would make unlocking the bootloader (which has to be done before fastboot can function properly) quite difficult.

borxnx said:
Would be a great idea, except I'm not sure you can get into Developer Options to enable Allow OEM Unlock while in Demo Mode, which would make unlocking the bootloader (which has to be done before fastboot can function properly) quite difficult.
Click to expand...
Click to collapse
You're right, in that I'm not sure either (about enabling Developer Options). But it's worth a try.

M1kesky said:
Just a quick question in case anyone knows:
At my place of work we have an old nexus 9 that's in pretty much perfect condition, but it was originally used in demo mode to for the display and as such, has been stuck in demo mode since coming off display.
One of the technicians claims he had a go at removing the demo mode a couple of months ago but with no success, I presume he tried at least a factory reset on it.
I'm not sure exactly what methods he tried but I was wondering if anyone here happened to know if this was possible?
It's basically sitting in a corner unused so worth a crack.
Click to expand...
Click to collapse
This ADB command should do the trick:
Code:
adb shell am broadcast -a com.android.systemui.demo -e command exit
Edit:
In case that sounded overwhelming and/or to help others with this issue, here's more more info about how to do that.
You must first install the ADB drivers to your PC. I suggest using Minimal ADB rather than installing the entire Android SDK, then use Command Prompt to navigate to your ADB directory (the folder where your ADB application is installed. Use the cd command to change directories [get it, cd?] to the complete filepath to the folder containing your ADB program in Windows. I put my Minimal ADB folder that I extracted from the zip directly onto the C:\ drive so the filepath is "C:\adb". I open my command prompt and type "cd C:\adb" and it's ready to roll. Super easy), once it says C:\adb> or whatever your filepath is, copy the command code above exactly into the prompt and press Enter.
To ensure your device is properly connected, after using "cd C:\adb" to get to your ADB application, run the command "adb devices". The daemon will start and it will either list your device number if it's successfully connected or will remain blank and go back to the "C:\adb>" prompt if it's not connected properly.
There may be a notification on the device when you try to connect ADB, but i may be getting this confused with ADB Debugging. If you see a notification pop up with warnings or aging your precision to connect to your PC just click the "chill out bro it's cool, I got this" button.
I hope you get it up and running properly and can enjoy your Nexus 9!
Sent from my XT1575 using Tapatalk

Thanks guys, I'm in work tomorrow so i'll take my laptop in and give it a try, thanks for all these suggestions!
I'll tell you the results afterwards.

Related

Is Fastboot a possible option yet on the NT?

I see they are flashing custom files / ROMs on the Kindle Fire using fastboot. I believe we are limited on this due to our current bootloader state, but does anyone with experience with Fastboot know if this may be a possible working option until we can get CWM / recovery ?
I agree, can someone please try this? I've seen romified asking this question several times but no one seems to have tried it. The chances aren't great, but it's definitely worth a try.
might be as simple as "adb reboot fastboot"
and then "fastboot oem unlock" or other commands (I'm not too familiar with them myself)
This harks back to the (not so long ago) days of flashing via fastboot on my HTC Magic, which have since passed since I move onto a SGS II.
Edit: Oops it wasn't romified who asked this previously. Can't remember who it was. But either way, that's not really important.
I have not asked about fastboot yet as I just though of it and did some quick research. I am comfortable hacking roms and decompiling files and what not, but bootloaders and hacking recovery is new to me (for now anyway) As soon as I get to where I can I will dig into it further but if someone knows it isn't going to happen with this bootloader, no need in wasting time on it. It could open the door for other possibilities as well. I tried to get fastboot to recognize my NT but no luck. It was just a quick try though.
Did you manage to get the NT to get into fastboot mode though? Probably using the adb reboot fastboot or adb reboot download command (unless we find the hard button shortcut to it)?
I don't have the Nook Touch yet, but will probably be getting one to play with soon (the gf has her eyes on one). Either way, the more capability unlocked, the better.
If you can get the device into fastboot, it's a matter of looking carefully at the USB device tree and seeing that you have a fastboot device listed, then digging through the strings until you find a string you can use to communicate with the device.
If Fastboot isn't included with the NT, it is available with a number of other software packages.
I know it's part of one of the Lenovo LeTools packages, for instance, which is available for download for Windows hosts. If you get the copy from LeTools, be aware that it will install (or try to) the LeTools.apk that's bundled with it from your computer to any bloody Android device that's attached, not just to Lenovo devices. So you may want to delete LeTools.apk after installing and before connecting your NT.
Or you might want to try leaving it there as an experiment. The apk does some interesting things, one of which is make your device discoverable via wifi, at least if it's a Lenovo branded device.
The release of LeTools I just confirmed fastboot for is available at http://consumersupport.lenovo.com/us/en/DriversDownloads/drivers_show_5004.html release IN12STW151WW5.exe.
You don't need to install everything to get fastboot - you can unzip the installer a couple of times to get to the install.msi file for just the tools.

[TOOL] Native ADB and Fastboot Flashable Zip

Hello All,
I have taken the liberty of re-packaging the adb binary and fastboot binaries so they will work naively on Android into a flashable zip file. With these tools, you can theoretically use your Android device (plus a USB OTG Cable) to connect to another Android Device. If your device has a native USB port (such as the ASUS Transformers), it will work as well.
As not to conflict with the official adb in /system/bin (which does not work the same way), I renamed these to "kadb" and "kfastboot". You just need to supply your own Terminal Emulator (such as connectbot) to use.
Example Uses
1) Unlock a bootloader on a Nexus device (erases all data on the target device)
kfastboot oem unlock
2) Lock a bootloader
kfastboot oem lock
3) Boot a recovery
kfastboot boot /sdcard/path/to/recovery.img
4) Flash a recovery
kfastboot flash recovery /sdcard/path/to/recovery.img
5) Reboot into the bootloader
kadb reboot bootloader
6) Shell
kadb shell
7) Reboot into recovery
kadb reboot recovery
8) logcat
kadb logcat
9) Sideload an APK file
kadb install /sdcard/path/to/APK.APK
10) Push a file
kadb push /sdcard/path/to/file /sdcard/path/to/destination
Please remember that these are taking place on the remote device connected via USB. Most, if not ALL ADB commands are supported. You can even modify most linux based one-click root methods (by changing all "adb" references to "kadb" and "fastboot" with "kfastboot") and run them via shell. Its also perfect for remote debugging of embedded Android Systems. Hell, the uses are endless!
Installation Instructions
Note : You do not need to be rooted, you do however need a custom recovery or temp boot a custom recovery.
1) Flash the attached Zip File via any Recovery such as CWM or TWRP
2) Reboot and install a Terminal Emulator, if using ConnectBot, you should choose the "local" option.
3) Connect a device and test
This should support any ARM based device, so far I have tested it on my ASUS Nexus 7 and ASUS Transformer 700 (Stock/Rooted)
HAVE FUN!!!
KMyers said:
Hello All,
I have taken the liberty of re-packaging the adb binary and fastboot binaries so they will work naively on Android into a flashable zip file. With these tools, you can theoretically use your Android device (plus a USB OTG Cable) to connect to another Android Device. If your device has a native USB port (such as the ASUS Transformers), it will work as well.
As not to conflict with the official adb in /system/bin (which does not work the same way), I renamed these to "kadb" and "kfastboot". You just need to supply your own Terminal Emulator (such as connectbot) to use.
Example Uses
1) Unlock a bootloader on a Nexus device (erases all data on the target device)
kfastboot oem unlock
2) Lock a bootloader
kfastboot oem lock
3) Boot a recovery
kfastboot boot /sdcard/path/to/recovery.img
4) Flash a recovery
kfastboot flash recovery /sdcard/path/to/recovery.img
5) Reboot into the bootloader
kadb reboot bootloader
6) Shell
kadb shell
7) Reboot into recovery
kadb reboot recovery
8) logcat
kadb logcat
9) Sideload an APK file
kadb install /sdcard/path/to/APK.APK
10) Push a file
kadb push /sdcard/path/to/file /sdcard/path/to/destination
Please remember that these are taking place on the remote device connected via USB. Most, if not ALL ADB commands are supported. You can even modify most linux based one-click root methods (by changing all "adb" references to "kadb" and "fastboot" with "kfastboot") and run them via shell. Its also perfect for remote debugging of embedded Android Systems. Hell, the uses are endless!
Installation Instructions
Note : You do not need to be rooted, you do however need a custom recovery or temp boot a custom recovery.
1) Flash the attached Zip File via any Recovery such as CWM or TWRP
2) Reboot and install a Terminal Emulator, if using ConnectBot, you should choose the "local" option.
3) Connect a device and test
This should support any ARM based device, so far I have tested it on my ASUS Nexus 7 and ASUS Transformer 700 (Stock/Rooted)
HAVE FUN!!!
Click to expand...
Click to collapse
Very interesting and nice work, certainly a lot of interesting possibilities for apps that could be written to take advantage of these features.
Awesome Post. Thanks Alot.Need this tool very much .
shimp208 said:
Very interesting and nice work, certainly a lot of interesting possibilities for apps that could be written to take advantage of these features.
Click to expand...
Click to collapse
Yeh... I can picture one of you going to a store and rooting all of the Demo Tablets or Phones with your phones. With a small amount of effort, one can port ZergRush or a few of the "adb backup restore" exploits over to run naively on your Phone or Tablet.
No GameStop, BestBuy, Sprint Store, T-Mobile Store, AT&T Store, CompUSA or WalMart is safe
KMyers said:
Yeh... I can picture one of you going to a store and rooting all of the Demo Tablets or Phones with your phones. With a small amount of effort, one can port ZergRush or a few of the "adb backup restore" exploits over to run naively on your Phone or Tablet.
No GameStop, BestBuy, Sprint Store, T-Mobile Store, AT&T Store, CompUSA or WalMart is safe
Click to expand...
Click to collapse
Or Verizon Store, or any other store that sells smartphones and tablets . You could make a app that has a run button that when pressed automatically run's a root exploit such as Zerg Rush, then permanently flashes a custom recovery, then a custom ROM of your choice all one after the other. Think of it as mix of z4root, EZ-Recovery, and ROM manager all rolled into one. Only problem is not every device supports fastboot so some devices would be left out. Also wondering if you wouldn't mind clarifying if the target device must be running a custom recovery or the host device must be running a custom recovery for this to work?
shimp208 said:
eft out. Also wondering if you wouldn't mind clarifying if the target device must be running a custom recovery or the host device must be running a custom recovery for this to work?
Click to expand...
Click to collapse
Hello,
Just the host device needs a custom recovery only to install the tools (this can be perm flashed or temp flashed (fastboot boot recovery.img). Once the tools are installed, the recovery is no longer used.
The target device only needs USB Debugging enabled.
You are also correct in your statement that not all phones respond to the Fastboot protocol. The other tools such as Odin and NVFlash are not so easy to package. Some devices such as the ASUS Transformer TF700 have a Fastboot mode, assuming you unlock the bootloader. Fastboot is the standard on all HTC, Sony and any phone bearing the sacred "Nexus" moniker. It is also favored among "cheap/knockoff" devices.
There are several root tools that simply use adb to work.
What?!
KMyers said:
Hello All,
I have taken the liberty of re-packaging the adb binary and fastboot binaries so they will work naively on Android into a flashable zip file. With these tools, you can theoretically use your Android device (plus a USB OTG Cable) to connect to another Android Device. If your device has a native USB port (such as the ASUS Transformers), it will work as well.
As not to conflict with the official adb in /system/bin (which does not work the same way), I renamed these to "kadb" and "kfastboot". You just need to supply your own Terminal Emulator (such as connectbot) to use.
.....
HAVE FUN!!!
Click to expand...
Click to collapse
I'm truly stumped as to why you don't have pages of thank you posts here but I wanted to add mine. So often I cannot get to my PC or just want more freedom but need to use Fastboot. Now I'm free! Thank you so much! I
rainabba said:
I'm truly stumped as to why you don't have pages of thank you posts here but I wanted to add mine. So often I cannot get to my PC or just want more freedom but need to use Fastboot. Now I'm free! Thank you so much! I
Click to expand...
Click to collapse
Thanks,
I guess the reason many have not downloaded this is because it was stuck in one of the lesser active sections of XDA-Developers. I assume that most people visit the portal and device specific development threads. Aside from being featured on the portal, not many ways to get people in here.
Just tried this out on my nexus 7 running ubuntu, this is indeed awesome, thanks for compiling it
Hi, just came across this whilst trying to find a solution to flashing a custom recovery on an Nexus 7 that i cannot get to a computer. (its in my car). this would fit my needs perfectly but i just cannot get it to work. wondering if im missing something.
ive tried using another N7, and also my Galaxy Nexus. i plug in using an OTG cable on host device, then a USB cable to the target device. the target device starts to charge, and it shows debugging icon on notification bar.
Then try "kadb devices" but shows no devices. could it be to do with the adb binaries needing updating? (current adb is 1.0.31, this one is 1.0.29).. All devices are running stock rooted 4.2.2 (except the target device, that im trying to root.)
i have a friend interested too, he tried with a 4.2.2 Nexus 7 to a HTC One X and is seeing similar issue.
hope theres an easy fix, or something obvious im doing wrong.
Cheers
Ross.
rmclardy said:
Hi, just came across this whilst trying to find a solution to flashing a custom recovery on an Nexus 7 that i cannot get to a computer. (its in my car). this would fit my needs perfectly but i just cannot get it to work. wondering if im missing something.
ive tried using another N7, and also my Galaxy Nexus. i plug in using an OTG cable on host device, then a USB cable to the target device. the target device starts to charge, and it shows debugging icon on notification bar.
Then try "kadb devices" but shows no devices. could it be to do with the adb binaries needing updating? (current adb is 1.0.31, this one is 1.0.29).. All devices are running stock rooted 4.2.2 (except the target device, that im trying to root.)
i have a friend interested too, he tried with a 4.2.2 Nexus 7 to a HTC One X and is seeing similar issue.
hope theres an easy fix, or something obvious im doing wrong.
Cheers
Ross.
Click to expand...
Click to collapse
Hello Ross,
The new "secure adb" that was introduced in Android 4.2.2 will not work at this time. You may be able to try running "adb devices" at root to see if it works for you. If not, you can manually reboot it into recovery and use kfastboot to flash the new recovery
Hi Keith, thanks for the reply.
sorry for my delayed response, busy few days!. I did have another go at seeing if i could get two devices talking to each other using kfastboot, but again, i dont seem to be picking anything up. "kfastboot devices" just returns me to the prompt with no devices listed. im trying between a galaxy nexus and another nexus 7. my other problem is that the one i have fiited in the car no longer has access to the volume keys, so i cant even manually get into the bootloader. Shame its not possible to turn off the secure adb feature. lol.
it was worth a try tho.
Cheers
Ross.
rmclardy said:
Hi Keith, thanks for the reply.
sorry for my delayed response, busy few days!. I did have another go at seeing if i could get two devices talking to each other using kfastboot, but again, i dont seem to be picking anything up. "kfastboot devices" just returns me to the prompt with no devices listed. im trying between a galaxy nexus and another nexus 7. my other problem is that the one i have fiited in the car no longer has access to the volume keys, so i cant even manually get into the bootloader. Shame its not possible to turn off the secure adb feature. lol.
it was worth a try tho.
Cheers
Ross.
Click to expand...
Click to collapse
Hello Ross,
If your device is currently rooted, you should be able to run an App from the Play Store to reboot it into recovery (https://play.google.com/store/apps/details?id=com.liveov.rebooter ), from there, kfastboot will work
Great tool. Just unlocked, installed recovery and rooted my Google Nexus 4 with my Asus TF300t.
It only took a while before I figured out that the first terminal command must be SU before I could use the kfastboot command.
Thanks for your work.
Harald
Verstuurd van mijn Nexus 4 met Tapatalk
777.300 said:
Great tool. Just unlocked, installed recovery and rooted my Google Nexus 4 with my Asus TF300t.
It only took a while before I figured out that the first terminal command must be SU before I could use the kfastboot command.
Thanks for your work.
Harald
Verstuurd van mijn Nexus 4 met Tapatalk
Click to expand...
Click to collapse
Hello,
You would be correct as Fastboot needs root access to be able to run (it is the same as fastboot on Ubuntu)
KMyers said:
Hello,
You would be correct as Fastboot needs root access to be able to run (it is the same as fastboot on Ubuntu)
Click to expand...
Click to collapse
Yes I know but did not remember it when using your great tool for the first time. Perhaps it is good to mention it in your first post.
You build a great tool, still amazed that I was able to unlock, root and install a recovery on my Nexus 4 thru my Asus tablet while on vacation . (laptop at home)
Just great.
Harald
Verstuurd van mijn ASUS Transformer Pad TF300T met Tapatalk
777.300 said:
Yes I know but did not remember it when using your great tool for the first time. Perhaps it is good to mention it in your first post.
You build a great tool, still amazed that I was able to unlock, root and install a recovery on my Nexus 4 thru my Asus tablet while on vacation . (laptop at home)
Just great.
Harald
Verstuurd van mijn ASUS Transformer Pad TF300T met Tapatalk
Click to expand...
Click to collapse
Yes, I had a similar issue a few weeks ago. I was in Texas for a few days and my HTC EVO 4G LTE had an unfortunate run in with the Drink Cart on the Airplane. I had to go out and purchase a new phone at the Sprint Store in Texas. I had the phone purchased and rooted in about 10 minutes . Thanks to revone, unlocking the bootloader on the HTC one took almost no effort and I had S-Off to boot. All from my ASUS Transformer 700
so this is only for nexus?
Thank you very much!,
Testing on Samsung Galaxy Y
Just what i was looking for
I am yet to test it out, but i surely am very happy to see this thing actually exists. Just googled it out of the the blue and "kaboom!"here it was..
Keep up the good work.
Cheers

Jide Ultratablet ADB-Fastboot Recovery Flash Problem

Where to begin? Logic would dictate, the beginning.
I'll do my best to be brief with the backstory.
Months ago I ordered a Jide Ultratablet to use as my portable workhorse. At first things were peachy until a rather monumental lag began to manifest every 15-45 seconds. It made the device impossible to utilize in any productive fashion, so I contacted Jide and opened up a support ticket. After months (in no way an exaggeration) of barely responsive correspondence, during which I sent them a video to demonstrate the problem, they finally came back to me with an email containing a link to a compressed folder containing the Remix 2.0 images, and also a link to a rather vague and complicated tutorial on how to flash Remix 1.5 manually to a device. (In fact, I tried to include a link to the tutorial, but I am unable to since I haven't posted to the forum enough. I am happy to PM it or email it to anyone who might like to help) I can only assume I am meant to apply the same logic to the Remix 2.0 files they sent me. Seemed a bit dicey at first glance, but while I'm by no means an expert, I'm no slouch in this arena and I'm a very quick study.
Now, on to the proverbial meat and potatoes:
If you were able to contact me for a link to the tutorial in question, you will have undoubtedly seen that they indicate one should use ADB-Fastboot as a means to flash the recovery image. No real surprises there. I have ADB and Fastboot installed on my PC (Windows 10). I also have the ADB drivers installed and have confirmed the addition to my PATH. (eg: ;C:\ADB) I can also confirm that it is working fine since I am able to pull up a terminal and issue the ADB command and it gives me the usual wall of commands. The problem is that my device (Ultratablet) is not being seen by ADB. I have checked my USB drivers and they are all up to date and installed properly. My PC sees the device no problem and there is no indication of any sort of connection error. I've also tried different cables and ports. Yet, I can't access it via ADB and thus am unable to issue commands to my device such as "adb reboot bootloader" or "fastboot reboot-bootloader".
My next logical approach was to attempt forcing the device into fastboot mode using the hardware button combination, which is not listed specifically for the Ultratablet anywhere, I might add. (Power key + Volume up) It brings me to a boot options menu with the selections "Continue/Fastboot Protocol/Recovery Kernel/Reboot/Poweroff/Forced Recovery". Ateempting to select Fastboot Protocol causes the display to shut off for a moment, the device to vibrate once, and then the display to turn back on back at the same menu full of selections.
So, in summary, I am expected to flash the device using fastboot and yet I can't even get the device into fastboot mode, let alone issue commands from my PC terminal. As I highlighted near the beginning, teh Jide support team is incredibly unresponsive and not overly helpful. I have notified them of this same set of issues, but I don't expect to hear back in any expedient fashion and I thought one of the mighty members here on XDA might be able to help me come up with a next step in the meantime. I'd cerainly love to be able to use my shiny new tablet.
In any case, thank you for your time.
Kind regards.
Shaiden
Bump? Anyone? Still swinging in the breeze on this one. No word back from the manufacturer, as expected. =/
I have the same problem
Shaiden said:
Bump? Anyone? Still swinging in the breeze on this one. No word back from the manufacturer, as expected. =/
Click to expand...
Click to collapse
I know it's been 4 years but did you find any solution to this? I'm asking because I have the same problem. I decided to downgrade to Remix OS 1.5 in order to root (I have tried 5 rooting apps with no success) but my device refuses to enter fastboot protocol. The whole idea was since I can't find a way to root the damn thing in its current state maybe I can manage it with its older OS version. All this just to turn it to android root apps "testing ground" device. Oof.

Help needed to bypass Lock Screen

Hi, I am trying to unlock a Galaxy J1 Ace SM-J111F/DS for my colleague. The phone belonged to his younger brother who had passed away in an accident, now that he's gone, we have no information as to now to unlock his phone.
I have tried researching and searching around for methods but to no avail. I was hoping maybe someone here could provide some assistance
A factory reset is out of the question as he needed to access information stored inside the phone
Some device details:
Device is locked by a pattern lock
Unable to unlock via Google account(No one in his family knows his account name/password)
Phone is not Rooted
Phone is FRP Locked
Things I have wanted to try and done so far:
Intended to flash a bypass to unlock the lock screen
Attempted to flash a custom recovery in order to flash the bypass, however FRP is locked and it does not allow a custom recovery to be flashed
Attempted various methods of "security exploits" to unlock, but appears to be patched on current firmware
Tried to search methods of unlocking FRP, however all the methods I've seen so far requires access to developers option, or requires a flash of stock firmware.
Tried accessing device via ADB, however it does not work as USB debugging is not enabled
I'm currently out of options trying to do this by myself, we would really appreciate it if someone could help us out in this
If powered on, and plugged in to PC, is it 'seen' at all?
robneymcplum said:
If powered on, and plugged in to PC, is it 'seen' at all?
Click to expand...
Click to collapse
Yes, it is "seen", but I can't do anything else to it
If it is seen, there is a chance you can get data off it.
You can install' minimal ADB and fastboot' and the USB drivers for the phone on your PC. If the phone is not encrypted you should be able to browse the phone storage in an adb shell and to copy files or directories with adb pull.
gl
Chilli
Chilli71 said:
You can install' minimal ADB and fastboot' and the USB drivers for the phone on your PC. If the phone is not encrypted you should be able to browse the phone storage in an adb shell and to copy files or directories with adb pull.
gl
Chilli
Click to expand...
Click to collapse
I have tried that as well, the only way I can get the phone to appear under "adb devices" is to select "apply update from adb" via recovery, even then it's only via sideloads, running shell returns an error
XenoJin said:
I have tried that as well, the only way I can get the phone to appear under "adb devices" is to select "apply update from adb" via recovery, even then it's only via sideloads, running shell returns an error
Click to expand...
Click to collapse
Ill jump in this one to. im in a similar situation. I have a lg g vista that no conventional method is working to bypass frp. Device is not encrypted. My prob is. I believe if i can downgrade back to stock kk which the phone was released with it didnt hve frp then so bam im in. But lgflash tool wont downgrade. Always errors. Loads of diffrent settings have been made. Also followed guides to a t.
But in ure case to if it is possible to dlmode and odin back to kk or earlier u should the be able to skil the google login totally. I dont know if ure device came with kk from factory or lolipop. Frp was implemented in loli so kk should be good. Maybe
Two comments:
1) I have a Huawei G8 in front of me. I worked all weekend with it with bootloader/fastboot. I wanted to test the lock screen/adb behavior, But to my surprise ADB does not find it w/ and w/o lockscreen. --> There are different possibilities why the phone does not show up (it worked in the past with this phone/notebook, but quit working). Before you flash make sure that your setup is working (best with an identical mobile). It seems that USB connection can behave different in Bootloader/Recover/Android OS mode.
2) I made a dirty flash (w/o erasing flash) of Lollipop over Marschmallow last weekend. The result was that many directories including SDCard0 where not accessible. Also user data was not accessible. And you have always the chance that you mess something up when flashing and you loose the content.
If the data is really important your friend could pay a data rescue company (if you don't loose your face). I'm pretty sure that programs exist that can be loaded into RAM with bootloader (fastboot boot) that provide an interface to the PC (in the easiest case, adb again).
Chilli

Blackview BV6600 - Flashing a new OS, Plz Help

Hi all,
Came by a Blackview BV6600 from someone who gave up on it - shipped saying that the device was 'corrupt and couldn't be trusted'. Went back and forth with their crappy customer service and gave up, sold it to me for cheap. It seems like a decently rugged phone but it does have a lot of bloatware and according to some threads on here about the mfgr I don't know if I trust them too much.
I'd like to wipe this phone, and I'm finding it difficult to locate a generic 'How to' for flashing a new OS to a phone. Disclosure; this is the first time I've done something like this. My experience is with computers, I know phones are a different beast and the user has much less freedom due to specifics of the hardware. If I say anything based on incorrect assumptions please correct me.
Again, what I would like to do is akin to installing Linux on what was a Windows box. I'd like to ****can as much weird chinese bloatware as possible (upto and including the entire OS) and replace it with some basic clean open source software. It seems like LineageOS does not have a version for Blackview phones, nor does it have a generic image. I notice that the Android open source project has 'Generic System Images' https://source.android.com/setup/build/gsi#flashing-gsis which sounds like what I want but references a vbmeta.img file which itself, as far as I can tell searching the forums, is likely manufacturer dependent, maybe phone dependent.
Anyway, I'm taking all the steps I see across enough sites to suggest they are platform-independent and won't brick my phone. Been following this video
since it's relatively recent and addresses my specific manufacturer.
So far I have:
Got developer permissions (go to Settings-About Phone, click build number repetitively)
in Settings-System turned on OEM unlocking and USB debugging
Figured out how to put this phone model in fastboot mode (hold volume up during restart)
Installed ADB and Fastboot (Linux), pinged the phone with "adb devices" and checked it's partitioning with " 'adb shell' <enter> 'getprop ro.build.ab_update' " no output, so that suggests 'A only'.
Next step seems to be:
oem unlock using fastboot. I seem to be having trouble here. In fastboot mode connected via USB, I can't detect the device. "Waiting for any device". 'adb devices' gives no response. No idea why. Phone screen looks exactly like in the video, hooked to USB that did return output for USB devices in normal boot mode.
Once I get over this dumb hump, I think I'll need to find a version of TWRP that will work on my device, install TWRP.
At this point I'm even more at sea: Most places suggest Magisk, but I've also seen explainers to wipe the old OS and install LineageOS.
If anyone has advice on what to do from here, specifically the near-term issue of not being able to find my phone via USB debugging while in fastboot mode, please let me know. But of course, long term I'm gonna need to know how to shovel this **** the phone came with out of storage and replace with a clean install so that is welcome as well.
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