Help with chinese 7840 - Dell Venue

Hi All,
I just got a wonderful Venue 8 7000 (7840),
problem is ONLY after double upgrading it (4.4=>5.01=>5.1) I found it's not international version, as I supposed, but is somehow tuned for china, so no google store/apps/account and lots of chinese apps I don't really need.
After searching around here, I found I should perform following steps,
please confirm if I'm right:
1) root the device using this procedure
http://forum.xda-developers.com/showpost.php?p=59203577&postcount=5
2) connect in tethered cwm and restore an original image like the one linked here
http://forum.xda-developers.com/dell-venue/general/dell-venue-8-7840-factory-fresh-t3026691
If correct, I'm having problem with both steps,
first I installed ADB drivers and rebooted tablet in fastboot mode
then I tried to follow steps at 1), but Intel Platform Flash Tool cannot write
(ps I tried both with and without externad SD inserted)
I tried also the procedure here
http://forum.xda-developers.com/and...t-temp-cwm-t2975096/post57543924#post57543924
using package IntelAndroid-FBRL-07-24-2015.7z
The adb connection seems ok, but still cannot write temporary cwm and proceed
(tried both T3 and T4)
One more thing: I can't find the option to enable USB debugging... I've searched all options under Settings
Please help !
thanks in advance

I fixed my problems following this EXTREMELY USEFUL guide for rooting and installing english rom
http://forum.xda-developers.com/dell-venue/general/root-howto-dell-venue-8-7840-t3282532
thanks a lot!

Related

Micromax A52 (ROM Backup Generic)

Hi friends,
I recently bought Micromax A52. Thought of rooting it and after looking on xda i figured that existing root methods didn't enable root privilege in Micromax A52. Thinking of trying the manual way to root ( Creating own methods to root).
I need your help in getting basic idea of few things.
I dont know/find where i can download A52 stock OS. Pleas guide me the process of backing up stock.
After stocking original os as we can easily restore to it, would like to proceed with the rooting steps. Wondering how a rooting softy (Superoneclick or z4root etc) works based on which i will be able to give a shot on it.
I know the queries here are silly but if you help me i could learn to master ..
Thanks
LN
lnarayanan86 said:
Hi friends,
I recently bought Micromax A52. Thought of rooting it and after looking on xda i figured that existing root methods didn't enable root privilege in Micromax A52. Thinking of trying the manual way to root ( Creating own methods to root).
I need your help in getting basic idea of few things.
I dont know/find where i can download A52 stock OS. Pleas guide me the process of backing up stock.
After stocking original os as we can easily restore to it, would like to proceed with the rooting steps. Wondering how a rooting softy (Superoneclick or z4root etc) works based on which i will be able to give a shot on it.
I know the queries here are silly but if you help me i could learn to master ..
Thanks
LN
Click to expand...
Click to collapse
You can try bm-smartphone-reviews[dot]blogspot[dot]in/2012/04/creating-rom-dump-of-your-mt65x3-device[dot]html, I will try this method after my exams are over. I am also new to android development.
sharmad247 said:
You can try bm-smartphone-reviews[dot]blogspot[dot]in/2012/04/creating-rom-dump-of-your-mt65x3-device[dot]html, I will try this method after my exams are over. I am also new to android development.
Click to expand...
Click to collapse
Thank you sharmad247. I tried them but failed. First of all it was because of MT65xx Preloader failed driver at boot and later in Factory boot mode identified the chip is MT6575 and searched for that particular driver. (Tried rooting as well)
Got the drivers from
HTML:
http://forum.xda-developers.com/showpost.php?p=26408058&postcount=9
and installed successfully.
Now started Smart Phone Flash Tool again and configured Readback.
Disconnected phone from Data Cable.
Clicked on Read Back button on Flash Tool.
Switched off phone. Removed battery.
Connected Data Cable.
Inserted Battery.
Press and Hold on Vol - UP / Down button. (Tried both ways)
Flash tool detected the driver (showed on status bar) and popped up the error attached.
Please try and let me know when you are successful in making backup (I can understand where i went wrong), Also please share backed up rom.
If you also want to root, I tried lots of possibilities but seems i missing some steps and rooting not successful yet.
Thanks
LN
No luck with me too
This seems to be 'Download Mode' error which our phone does not support or does not have it. But has a recovery mode with limited options.
I too tried this on Ubuntu 11.04, but no luck.
How to do complete backup your rooted A52.
Follow 3rd method of backup.
http://www.addictivetips.com/mobile...es-boot-recovery-and-system-partition-images/
Custom rom
Get the Lates Custom Rom from Here......................................
http://forum.xda-developers.com/showthread.php?t=2013128
help with stock rom
guys i have a installed a custom rom but now i need the stock rom can anyone post the stock micromax a52 rom
After Update phone not boot
When I update CWM for mmx a52 which steps gave on here but when phone was reboot then its not boot or any process run. just stay...
lnarayanan86 said:
Thank you sharmad247. I tried them but failed. First of all it was because of MT65xx Preloader failed driver at boot and later in Factory boot mode identified the chip is MT6575 and searched for that particular driver. (Tried rooting as well)
Got the drivers from
HTML:
http://forum.xda-developers.com/showpost.php?p=26408058&postcount=9
and installed successfully.
Now started Smart Phone Flash Tool again and configured Readback.
Disconnected phone from Data Cable.
Clicked on Read Back button on Flash Tool.
Switched off phone. Removed battery.
Connected Data Cable.
Inserted Battery.
Press and Hold on Vol - UP / Down button. (Tried both ways)
Flash tool detected the driver (showed on status bar) and popped up the error attached.
Please try and let me know when you are successful in making backup (I can understand where i went wrong), Also please share backed up rom.
If you also want to root, I tried lots of possibilities but seems i missing some steps and rooting not successful yet.
Thanks
LN
Click to expand...
Click to collapse

[Q] Rooting android 4.04 allview P5

Hello, i just recently purchased an Allview P5 smartphone, it's really cost efficient but recently i started getting some problems because the phone is not rooted and i was wondering how to root the android 4.04. i tried the superoneclick 2.3.3 and installed adb and something from java, bu when i rung the program superoneclick the program just freezes and it's not responding. any suggestions or guides that i should follow?
best regards
Chris
Try root for HaiPai I9220. For me it works.
Having the same problem here, Superoneclick freezes on step 7 iirc.
HaiPai didn't work for me either
So that: http://forum.xda-developers.com/showthread.php?t=1923764
There you will find this: http://www.mediafire.com/view/?othd1gf76pa97zg
It is 100% functional, but need more knowledge and skill.
Ok, I came a lot further this time, but still stuck.
As soon as I let Cygwin `patch` the recovery.img, it does the patching and stuff, but it doesn´t create a new recovery.img for some reason..
If you check page 13 of that PDF manual: I get all the same messages in Cygwin, except for that "Repacking" bit.
Any Idea why it isn't repacking?
Losing my nerves a bit because of Cygwin, what a horrible program to get to work properly. Installation went on beyond 100%, till about 2000% and then just started to count further in negatives >____<
You must have installed 7-zip archive program.
SuperOneClick should work for this device. You may try this:
1) unmount the sd-card, turn ON usb-debugging
2) turn OFF usb-debugging
3) connect device to PC
4) click "Root"
5) when "Waiting for Device" appear turn ON usb-debugging
6) when "Starting ADB Server..." turn OFF usb-debugging
7) then turn it back ON
8) and back OFF
9) repeat this while "Waiting for Device" appears again.
@Stovka: I have 7zip installed, the unpacking/extracting of the recovery.img goes fine in Cygwin, but for some reason it just skips the repack part.
@AndreyETO: As soon as I disable debugging mode, superoneclick stops the procedure, so I didn't get far with that
So sorry, I don't really know what is the problem...
It was all ok for me - the one problem was that I had not installed 7-zip, but after installing it worked exactly according to instructions.
If it were successful: after recording recovery.img to the phone is first necessary to go into CWM mode (no run phone) and install the root file attached. End CWM recovery mode is classically done by clicking on "reboot system now", but after the first time there appears one more option (just I don't know what name), which must be confirmed! Otherwise, when you restart the phone again, then will be loaded the original file and the recovery process must be repeated - upload modified recovery.img and then root file via CWM.
Found another way to root, and it worked
I used the method in this topic: http://forum.xda-developers.com/showthread.php?t=1886460 )I used the current newest version:V15)
The first time it didn't work, but after rebooting the phone and trying again it was succesfull
Anyway, thank you guys for trying to help.
Flapperbol said:
Found another way to root, and it worked
I used the method in this topic: http://forum.xda-developers.com/showthread.php?t=1886460 )I used the current newest version:V15)
The first time it didn't work, but after rebooting the phone and trying again it was succesfull
Anyway, thank you guys for trying to help.
Click to expand...
Click to collapse
Hey, i also tried this, and it didn't work, after clicking on restore that the device restared and than on the comand promp console it said error: device not found, i tried repeating the process several times but it didn't work, any other ideeas?
Neither of those above work for me either.. So... any other suggestions?
Confirmare
sics3th said:
Hello, i just recently purchased an Allview P5 smartphone, it's really cost efficient but recently i started getting some problems because the phone is not rooted and i was wondering how to root the android 4.04. i tried the superoneclick 2.3.3 and installed adb and something from java, bu when i rung the program superoneclick the program just freezes and it's not responding. any suggestions or guides that i should follow?
best regards
Chris
Click to expand...
Click to collapse
( for P5 allview mtk6577 4.0.4 ics2 )
Search this Root_with_Restore_by_Bin4ry_v15.7 on the forum. It works like a charm (both on linux and windows ).
It use restore feature on the phone.
The link is here http://forum.xda-developers.com/showthread.php?t=1886460
http://forum.xda-developers.com/attachment.php?attachmentid=1398011&d=1350123242
Anyone found a safe way to root this phone? Or maybe a custom rom for this one?
I think it is a great phone which should has a place into xda forum
Root_with_Restore_by_Bin4ry_v15
i have downloaded version 15 of this, because v17 for some reason did not worked...
so go ahead and enjoy.
Flapperbol said:
Found another way to root, and it worked
I used the method in this topic: http://forum.xda-developers.com/showthread.php?t=1886460 )I used the current newest version:V15)
The first time it didn't work, but after rebooting the phone and trying again it was succesfull
Anyway, thank you guys for trying to help.
Click to expand...
Click to collapse
i can confirm that this works.
now, can anyone tell how i can make a nandroid for this phone? couldn't find any image to boot with so i can see the partitions and use linux dd
U all can use this metod:http://forum.xda-developers.com/showthread.php?t=1886460 for rooting P5 Mini.
And watch this video tutorial:http://forum.xda-developers.com/showthread.php?p=33470626#post33470626
I rooted my P5 Mini with "Root_with_Restore_by_Bin4ry_v15" and it works fine.
works for P6 also
Flapperbol said:
Found another way to root, and it worked .
Click to expand...
Click to collapse
Same experience on Allview P6 Stony (P6_0201_V1179 software build). This method works for me - similarly I had to run the script (and the reboot cycle) 2x before it had an effect.
As pointers for others, before you try this method you need to make sure you have ADB drivers installed. Trying to install stock google drivers didn't work at all for me, what worked for me was installing latest PdaNet drivers (pdanetZ350.exe) from here: junefabrics.com/android/download.php *
Don't forget to install OTA Rootkeeper app afterwards and run it once - hopefully saves you the hassle of rooting again if the P6 should receive an incremental update.
Enjoy, thanks Flapperbol!
(*= sorry Im not allowed to post links)
Version 18 also works
Just to let you guys know that version 18 of Root_with_restore works. I just the ADB drivers from the PDAnet install (which I cancelled after the drivers were installed) and the phone is now rooted!
Does anybody know how to get rid of those ugly allview icons? I hate those things.
neelz said:
Just to let you guys know that version 18 of Root_with_restore works. I just the ADB drivers from the PDAnet install (which I cancelled after the drivers were installed) and the phone is now rooted!
Does anybody know how to get rid of those ugly allview icons? I hate those things.
Click to expand...
Click to collapse
u can install a new home launcher.i use nova launcher 2.0 prime and u can download icon package and install in nova

[Q] Alps S5 octacore, ROM readback and root

Hi, I just bought this phone from TECA Mobility, it turns out to be an Alps S5. See attachement for a detailed description.
I tried to ge the root. I tried some different tools, without success.
MTK Droid Tools ROOT button doesn't work but gives a link to xda's MKT forum, so I started with the recommended procedure. I tried to read back the ROM with SP-FlashTools but no way, it doesn't start. I also made some attempts with the Android SDK but adb backup of course doesn't work for the System partition without root.
When I send the adb reboot recovery command the phone goes in download mode, with the adb reboot bootloader command it goes in fastboot mode, while to have it in the factory recovery mode I have to manually hold down the start and vol down buttons. However, it doesn't matter, the readback does not start.
Should I try to install the CWD recovery without having a backup of the ROM? I think it's too risky. I looked at NEEDROM to see if I can find my ROM, but didn't find. I found these, "S5 SM-G900 MT6592", but I cannot be sure it's the right one.
Somebody can help me? I want to root the device.
gt56 said:
Hi, I just bought this phone from TECA Mobility, it turns out to be an Alps S5. See attachement for a detailed description.
I tried to ge the root. I tried some different tools, without success.
MTK Droid Tools ROOT button doesn't work but gives a link to xda's MKT forum, so I started with the recommended procedure. I tried to read back the ROM with SP-FlashTools but no way, it doesn't start. I also made some attempts with the Android SDK but adb backup of course doesn't work for the System partition without root.
When I send the adb reboot recovery command the phone goes in download mode, with the adb reboot bootloader command it goes in fastboot mode, while to have it in the factory recovery mode I have to manually hold down the start and vol down buttons. However, it doesn't matter, the readback does not start.
Should I try to install the CWD recovery without having a backup of the ROM? I think it's too risky. I looked at NEEDROM to see if I can find my ROM, but didn't find. I found these, "S5 SM-G900 MT6592", but I cannot be sure it's the right one.
Somebody can help me? I want to root the device.
Click to expand...
Click to collapse
Hi
1) First root your device using MTK Chopper (from PC) or framaroot (from android app) . Both work fine for MTK phones
2) Then using MTK droid tools backup your ROM. Here is the guide for that
http://forum.xda-developers.com/showthread.php?t=2730031
3)Then using MTK droid tools , make CWM recovery for your phone and install it . Here is guide for that
http://forum.xda-developers.com/showpost.php?p=44660171&postcount=417
Hit THANKS if it works
4shreyas said:
Hi
1) First root your device using MTK Chopper (from PC) or framaroot (from android app) . Both work fine for MTK phones
2) Then using MTK droid tools backup your ROM. Here is the guide for that
http://forum.xda-developers.com/showthread.php?t=2730031
3)Then using MTK droid tools , make CWM recovery for your phone and install it . Here is guide for that
http://forum.xda-developers.com/showpost.php?p=44660171&postcount=417
Hit THANKS if it works
Click to expand...
Click to collapse
I think you mean MOTO Chopper? It doesn't work, same as framaroot. They are old tools, they don't work anymore on the ROMs released after June 2014.
ODIN could work but I have not the sure/right file to download.
Generally speaking, the first thing to do is that of getting a backup of the ROM from the un-rooted phone
The guides that have been reported to work in these cases are:
From XDA:
http://forum.xda-developers.com/showpost.php?p=38337401&postcount=5
From China Devices:
http://www.china-devices.com/Thread-ROOT-CWM-Readback-your-ROM-with-SP-Flash-Tools#
Hereunder is the link to a success case story:
http://www.china-devices.com/Thread-Rooting-new-octacore-S5
There is no way I know to get the root with one-click-tools, there is no case I could find of anybody being able to root these phones by following other procedures.
If anybody knows better, please send me a link (MTK phones with ROM s released after june 2014 only!!!)
My only problem now is that I cannot get the read back with Flash Tools. I have tried uncountable button-pressing combinations, I have put the phone in recovery, download, fastboot mode, I have tried with and without battery, phone switched off or on - no error, but the read-back doesn't start (however my phone doesn't have the USB connection working when it's off or without battery).
The only way to skip this step is, if I had already a copy of the firmware available, a sure one.
Kindly help me if you can
Hi
Odin doesn't work for MTK mate
Try this latest app . It worked for some latest MTK KK phones
http://www.kingoapp.com/index.htm
Some other KK phones got rooted using vroot and rootgenius
Try your luck
Final option is to read back from SPFT which has 90+ success rate
Link to your stock firmaware: ( Official ROM Kingelon G9000 Version: 20140710_e2706v92_jbla_fhd -> This model number matches with model no in your image)
http://www.needrom.com/download/alps-star-kingelon-g9000-style-s5-touchwiz/
As bizarre as this sounds, I managed to get root on a similar phone (another MTK6592 S5 knockoff) with MTK tools. After exhausting my options, I clicked the ADB button and tried to get root shell regardless (via 'adb root shell', which probably isn't the proper command but it works regardless), which caused some sort of hang. After a minute or so I unplugged my phone, which caused things to start responding again; plugging it back in showed me as having temporary root, and the get root button actually worked the next time I tried it. I have no idea how or why it worked, or if it was a once in a lifetime occurrence, but it can't hurt to try.
Also, if your phone is anything like mine (and is actually running some form of KitKat), good luck getting write support for external SD cards. I couldn't get the system partition to mount (to write changes to the necessary file) via anything but ADB shell.
Problem solved
Good to know, thank ypu.
However in the meantime I solved my problem.
My phone works this way: I have to remove the battery and connect it to the USB cable. Then it goes in "preloader mode" and tries to install a driver called "MT65XX preloader driver". This driver actually emulates a COM port. If data transfer doesn't start, then, after a few seconds, the device goes down and disappear from Windows list. So it is easy to miss it when we install all drivers. I had to dowload it (from Google cloud service in my case), install and ... the Read Back started !!! Now I have completed the procedure and my phone is rooted with the CWD recovery installed.
ALPS S5 phone, real FLASHROM total size, 64GB ext SDcard not working
FEGuy said:
As bizarre as this sounds, I managed to get root on a similar phone (another MTK6592 S5 knockoff) with MTK tools. After exhausting my options, I clicked the ADB button and tried to get root shell regardless (via 'adb root shell', which probably isn't the proper command but it works regardless), which caused some sort of hang. After a minute or so I unplugged my phone, which caused things to start responding again; plugging it back in showed me as having temporary root, and the get root button actually worked the next time I tried it. I have no idea how or why it worked, or if it was a once in a lifetime occurrence, but it can't hurt to try.
Also, if your phone is anything like mine (and is actually running some form of KitKat), good luck getting write support for external SD cards. I couldn't get the system partition to mount (to write changes to the necessary file) via anything but ADB shell.
Click to expand...
Click to collapse
Maybe your phone was using firmware dated before june 2014? These was a bug that was exploited by Framaroot, but now they fixed it.
Is your phone also from ALPS? They sold it to me as capable of installing an external 64GB SDHC card, but I cannot have it working. Did you face any similar issue?
Otherwise 32GB cards work fine. Have you tried Aparted app? I use it for formatting/maintenace. This app makes partitioning, I guess it should work.
Also, if your phone is from ALPS, does it really have the ROM memory that is advertised?
I am facing some interesting issues with my phone on this respect. It was sold as having 16GB internal ROM, of which about 12GB avalible for users. In fact, the settings menu shows 10GB ,( 8GB available) of internal memory, and about 4GB of phone memory. Well, if I am correct, this so called internal memory maps to the directory /data (the one highest level in the root), who corresponds to partirtion mmcblk0p7. This partition actually has a size of 2.3GB instead of 10 !!!. f I install and try to run online Nandroid backup, I cannot have it working on paths directed towards the SDcards, but it works on the path data/media. Well, a backup of about 1.2GB is shown in the setting menu of the phone as a memory consumption of about 5 GB !!!
Then I had also hard time in copying this file from the /data directory to one of the SD cards. Root Browser and Root Explorer didn't work, only ES Manager with root rights worked.
Maybe you can give me some advice in finding some tool or SDK procedure to assess what the real total size of the memory is? Or some suggestion on how to fix the ext 64GB card? I got bad feelings with the guys who sold this phone to me, so I would like to collect some more evidence if possible.
I downloaded some applications for making device inspection. They read the manufacturers' data, so they get cheated - even if, in some cases, they can show the right amount of unused memory still available (quite lower than declared by the phone) . Also I cannot see the real size of the RAM memory used by the CPU .
Need stock ROM for Teca g89 mobile.
Hi experts,
I need stock ROM of TECA G89W ANDROID 4.4 2.4GHz 4GB-RAM +32GB 18MP 5.5-inch GPS SMARTPHONE. I brought this phone 6 months back and unfortunately the software corrupted. I tried with other ROMs and currently bricked my phone. If anyone who might have this phone by fortunate can help me to post the stock rom by read back or any process whatever you wish as you know much than me.
Desperately need the ROM file as I want to have my phone back to working.... Thank you....
need that rom
hello. can you ... or someone else, upload that rom again?
the link is no longer online at needrom, and that was the best rom for my kingelon g9000.
i had made a flash to try another rom, but is wasn't better. when i wanted to download again that ALPS rom it was no longer online!
gt56 said:
Hi, I just bought this phone from TECA Mobility, it turns out to be an Alps S5. See attachement for a detailed description.
I tried to ge the root. I tried some different tools, without success.
MTK Droid Tools ROOT button doesn't work but gives a link to xda's MKT forum, so I started with the recommended procedure. I tried to read back the ROM with SP-FlashTools but no way, it doesn't start. I also made some attempts with the Android SDK but adb backup of course doesn't work for the System partition without root.
When I send the adb reboot recovery command the phone goes in download mode, with the adb reboot bootloader command it goes in fastboot mode, while to have it in the factory recovery mode I have to manually hold down the start and vol down buttons. However, it doesn't matter, the readback does not start.
Should I try to install the CWD recovery without having a backup of the ROM? I think it's too risky. I looked at NEEDROM to see if I can find my ROM, but didn't find. I found these, "S5 SM-G900 MT6592", but I cannot be sure it's the right one.
Somebody can help me? I want to root the device.
Click to expand...
Click to collapse
Hi see if the link helps you to find the mach of your phone model file:///data/data/com.android.browser/files/kingelon_g9000.mht
---------- Post added at 04:58 PM ---------- Previous post was at 04:53 PM ----------
gt56 said:
Hi, I just bought this phone from TECA Mobility, it turns out to be an Alps S5. See attachement for a detailed description.
I tried to ge the root. I tried some different tools, without success.
MTK Droid Tools ROOT button doesn't work but gives a link to xda's MKT forum, so I started with the recommended procedure. I tried to read back the ROM with SP-FlashTools but no way, it doesn't start. I also made some attempts with the Android SDK but adb backup of course doesn't work for the System partition without root.
When I send the adb reboot recovery command the phone goes in download mode, with the adb reboot bootloader command it goes in fastboot mode, while to have it in the factory recovery mode I have to manually hold down the start and vol down buttons. However, it doesn't matter, the readback does not start.
Should I try to install the CWD recovery without having a backup of the ROM? I think it's too risky. I looked at NEEDROM to see if I can find my ROM, but didn't find. I found these, "S5 SM-G900 MT6592", but I cannot be sure it's the right one.
Somebody can help me? I want to root the device.
Click to expand...
Click to collapse
Hi see if the link helps you to find the mach of your phone model file:///data/data/com.android.browser/files/kingelon_g9000.mht , you can root it using v root you will need a pc to root your phone.

Need help with the unrootable Wiko JERRY

This is my second ever post on this forum (although I've lurked for a while). Would any of you be willing to help me out with the rooting process on the Wiko Jerry? I've tried every method I could find but to no avail. I'm completely new to rooting so I might have made some noobish mistakes.
What I've done/tried so far:
- Unlocked bootloader and enabled USB Debugging in the phone's developer options
- Installed ADB/Fastboot drivers (although my device isn't detected in fastboot mode)
- Run every 1 click root software solution (including APK's) under the sun (unsuccessfully)
- Install MTKdroidTools (which couldn't create a scatter file)
- Install Android USB drivers (although I'm unable to install Android Bootloader Interface)
Why do I want to root this phone so badly? I want to be able to recover my files (mostly photos) after a factory reset using Diskdigger and for that I need root access.
I hope I haven't left anything out and I hope you're willing to help a newbie out! Thanks in advance!

Bootloop Nexus 9 WiFi - official newest version Android 7

Hello my dear fellow community of XDA
I’m asking you for help, I found myself in a tough situation because I damaged system in tablet Nexus 9. Bootloader was already unlocked in my device when I bought it. I assume that the system was original. I didn’t notice any modifications. I damaged this system by uploading a file in a fastboot mode connected by ADB. This file is for rooting. I used this guide on the YouTube:
After doing everything step by step in this guide and switching my device on there was a sign of launching - vibration. The next thing I saw was white Google logo and after that the animation of loading appeared. It was loading without any success.
Before uploading the root file I also tried to upload TWRP file via ADB but it didn’t make any difference. After uploading TWRP files system launched properly, there is no new app in the app list and no combination of buttons such as power + volume that launches TWRP. Please tell me if I’m doing something wrong…
I tried to fix this bootloop by cleaning files via Hboot - factory reset but it didn’t change anything. I was searching for guides that would help me solve my problem but I couldn’t find anything useful. Each of them was old. They were from 2014 or 2015.
I would like to have a working tablet with TWRP, root and other unofficial system (you can give me some suggestions, I was thinking about Android 9). I don’t know where to start or what should I do first. Fix bootloop or upload TWRP ? What is correct order ? How to upload TWRP eligibly ? I rooted devices only several times so please excuse me, I am not a professional. I know that guide on YouTube mentioned before was for Android „L” not „N”.
Summary:
> Tablet Nexus 9 OP82100 WiFi version 32GB
> I use PC with Windows 10
> After connecting the tablet to the PC via USB cable in fastboot mode the tablet is visible in ADB console on the list of devices.
I hope that each information I gave you is clear enough. This is my first post on this forum. I hope somebody will find some minutes for reading this post. I’m counting on you. Thank you in advance for any help.
Ok, I honestly didn't read everything, but if you have and can access fastboot, flash TWRP, transfer a ROM to the internal memory, wipe data (not storage) and flash your ROM.
Try getting Wug's Nexus Root Toolkit, it's a graphical UI for adb and fastboot, might be a little friendlier for you.

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