[Q] Help Lenovo Yoga 8 B6000-F in boot loop - Android Q&A, Help & Troubleshooting

I have a a Lenovo Yoga 8 B6000. Im running 4.4.2 and after some fiddling, used Vroot to root, and subsequently went through some arduous steps to finally remove the Vroot and replace with SuperSu. Life was good. Then I got a little careless when removing some of the bloatware and ended up with a constant boot-loop problem. And of course, no backup. (whoops!)
I have been researching this the past 2 days for a workable solution and am reaching out for some more refined assistance.
Here is what I have done thus far:
When pressing Power + VOL+/- I get to the initial recovery menu which gave me: Recovery, Fastboot, and Normal. After selecting the "Recovery" mode, I get the "No Command", after which I pressed the power button one more time and got into the English recovery menu. I show
Android System Recovery <3e>
B6000_A442_001_026_141117_WW_WIFI
Reboot System Now
Apply Update from ADB
Apply Update from SDCard
Apply update from Cache
Wipe data/Factory Reset
Wipe Cache Partition
I attempted to wipe the cache, followed by Wipe data/Factory reset. Following this procedure, I remained in the boot loop.
I installed ADB Flashtool drivers for WIN7 and attempted to use flash tool which was also suggested on this site. I got a 4.2.2 ROM "B6000_A422_000_059_131219_WW_WIFI" from a russian lenovo forum site to use with the flash tool and because the tablet continues in boot loop when starting, there was no loading of the ROM from that method.
I put the rom on an SD card and went into recovery mode. The ROM was not visible by the recovery menu (By that I guess the Apply Update from SDCard is looking for a specific file extension, which is not present).
I may have tried a few other things which are not popping into my head at the moment.
Im kind of at a loss and looking for any ideas from the gurus out there on how I might be able to get any kind of ROM to flash onto my B6000 and getting it up and running again.
Thanks

I was able to successfully fix the Yoga 8 tablet by using the instructions here:
//aluk4rd.wordpress.com/2014/09/08/an-easy-guide-for-restoring-your-stock-4-2-2-firmware-on-your-lenovo-yoga-tablets-8-and-10-b6000-and-b8000/
The trickiest part was getting the Mediatek driver installed. I use a dual booting MAC with WIN7 and sometimes there are some kwirks when operating in WIN7. However, the results of the instructions brought my tablet back to life, as well as downgrading to 4.2.2

Hi engineer2loggie,
How did you get that firmware? Can you tell where can I download it?
Thanks.

has anybody found a solution to this? im stuck with the same problem atm

Related

[Q] Lenovo A830 Boot Loop No Recovery

I have a problem with one of my Lenovo A830 phones.
I bought it from Etotalk, so it came rooted, and with their custom version of the Lenovo Stock ROM and their custom version of CWM 5.5 installed.
I tried formatting my SD card and then doing a factory data reset from within the operating system. (I was intending to install MIUI V5 after rebooting into recovery).
However, on rebooting, the device is now caught in an infinite boot loop, and I am not able to boot into recovery mode (by holding down power and both volume keys). It loads the initial splash screen, then shows a few seconds of the Android character and some whirring cogs before rebooting.
I am able to boot into Factory mode (power and volume up) or Meta mode (power and volume down). Factory mode has a number of options, but they are all in Chinese characters, which I am unfortunately not able to read.
I did notice that my SD card seemed to be write protected when I tried to format it in my computer and to copy on the new ROM - I solved this by putting it in a different phone and reformatting it. I wonder whether the factory reset process has write protected something it shouldn't have?
Does anyone know how I might best proceed? I've been digging around on the forums, and tried a few things, but there's nothing which seems to provide a coherent solution for this problem.
I've got the latest Android SDK Tools, MTK Droid Tools 2.4.8, SP Flash Tool 3.1312, some additional ADB drivers (120827 v3.7) that I'm not sure how to install, the latest MIUI V5 ROM (3.8.16), and the latest stock Lenovo ROM (S118 from Need A ROM, just in case I need it).
Maybe different SP Flash Tools version?
I had trouble using SP Flash Tools v3.1312 with A830. Once I switched to v3.1304.0.119 I was able to flash both the original ROM and the custom MIUI one without serious issues. I'm unable to post the download link but google it.
One other thing is that when connecting the phone, it usually loads the something something Preloader driver, which is no good (even if it gives you Download OK). When attempting to flash either ROM, try pressing both the power and volume up buttons while connecting the phone (after pressing Download), only way it worked for me.
Good luck!
I managed to sort this out quite simply in the end!
On the Lenovo A830 (and presumably other Lenovo Android phones?), you enter recovery by pressing power and then pressing volume up / down together after a short pause. The short 1 - 2 second pause is important, because if you try and press them at the same time or in quick succession it doesn't seem to work.
I then installed MIUI V5 from the SD card followed by Google Apps after a reboot. In order to get MIUI to install, I had to remove the assert check at the top of the update script, because this seems to erroneously check for the A820 (even though there isn't currently a port for this device?). It's working excellently with two exceptions - I am unable to select the SD card as a storage device, and Google Play store is not searchable (it causes a Force Close).
tominglis said:
I managed to sort this out quite simply in the end!
On the Lenovo A830 (and presumably other Lenovo Android phones?), you enter recovery by pressing power and then pressing volume up / down together after a short pause. The short 1 - 2 second pause is important, because if you try and press them at the same time or in quick succession it doesn't seem to work.
I then installed MIUI V5 from the SD card followed by Google Apps after a reboot. In order to get MIUI to install, I had to remove the assert check at the top of the update script, because this seems to erroneously check for the A820 (even though there isn't currently a port for this device?). It's working excellently with two exceptions - I am unable to select the SD card as a storage device, and Google Play store is not searchable (it causes a Force Close).
Click to expand...
Click to collapse
Hello,
How did you manage to fix the reboot loop?I have the same problem,after a factory reset the phone just reboot like you said in first post...please help me fix it...
claudiuionel said:
Hello,
How did you manage to fix the reboot loop?I have the same problem,after a factory reset the phone just reboot like you said in first post...please help me fix it...
Click to expand...
Click to collapse
Hi I had similar "reboot loop" problem this morning after a phone factory reset.
I have no idea how I solved that but the following was the steps I tried:
1. Install the MTK6589_PdaNET_ADB_VCOM_Drivers. Skip the USB connection during setup. Start the PdaNET after setup finished.
2. Insert battery inside the phone and connect the phone with the computer by USB
In my case, the phone reboot loop once, and the lenovo screen appeared in the second restart. The phone hanged. I unplugged the cable, took out the battery, insert the battery again and start the phone normally again and it is working now.
I recommend installing the recovery rom after you have fixed the phone.
Goodluck

[Q] CWM recovery boot loop

I attempted to root a denver tac-70061 tablet in order to be able to switch the mounting of the internal and the external sdcards. I have only rooted once before; a denver tac-70031 tablet which was extremely easy to root by simply installing and running the superuser app. Unfortunately, it seemed that it was not as simple on the 70061.
As I am a novice, I followed the instructions blindly and read them through a number of times before attempting.
I followed a set of instructions which described downloading a zip file which contained adb for windows and some img and zip files to transfer to the sdcard.
I am using ubuntu, so I assumed that the adb which was installed along with android sdk would suffice.
I copied the required files to the root of the tablet's internal sd card and installed recovery via adb.
I unplugged the tablet and rebooted in recovery holding down volume-up while powering on.
When in recovery, the instructions told me to install superuser 3.1.3.zip from the sdcard but this file was not present.
When selecting 'reboot', the tablet kept rebooting to recovery and now seems to be stuck in a loop.
I hope that someone can help.
Factory Default reset?
How do you even get into the recovery menu. W/o I try, I get to the screen with the stupid robot laying down, and a ! inside a triangle showing. What buttons do you press to open recovery menu? On that page, no lists of stuff appear, and I want to reset the android tablet I used, also a TAC-70061, b/c it just keeps loading on the 3rd boot screen, and never gets passed it. Lame Denver product is not worth 2 cents. Apart from how annoyed I am, can you explain to me how to get into the factory reset and reset it/fix it?

Bricked Asus TF103C

Hi all.
I have an Asus TF103C that had been updated to lollipop that is currently (soft?) Bricked
I've been through pretty much all the threads and tried all of the fixes. Still unable to boot into android. I am unsure what step to take next. I cant apply official firmware updates via SD card nor sideload via ADB
Currently I can get it to boot up to a UEFI BIOS screen(where I can only scroll up and down via volume keys on the first page and nothing else.) or a fast boot screen showing firmware version ( 209.05 just incase its needed.) I can get it back to a droidboot screen, but I still cant flash any system img. If it's important this tablet uses an Intel Z3745.
Just a quick bump. Still only have access to the fastboot screen and recovery. I attempted flashing images again, and while it eventually goes through after breaking the image down into smaller parts, upon reboot I'm stuck at the android screen.
Open to any help what so ever.
It should also be noted that upon flashing via fastboot, after the system image goes through, I get the error " Flash Capsule Failed." And then it reboots to just the android screen.
Mine also bricked
Hi cronus2
Did you manage to solve this problems? I gather from your second post that you managed to get past uefi... I'm still stuck there: how did you do that?
Thanks to anyone who can give me some help here...

Karbonn A9 plus phone hard bricked... PLZ HELP!

Hi XDA members!
An urgent help is needed to fix a hard brick problem with my smartphone model. I've searched for my model make in this forum and tried all the methods of recovery relating to Karbonn A9 plus/cherry flare but no success till now...
So, here's the detailed explanation of how my phone got hard bricked:
Originally my phone had a bootloop issue where it would start with the phone model logo and get stuck at the boot animation. It would never go into android. (where it would be detected as an adb device in windows). So, I rectified it via fastboot mode flashing of my rom using AIO flashing tool. Then I delved deeper into the forums here and found out android kitkat update for my phone model. (my current version being ICS 4.0.4). I got ambitious and went ahead with flashing android kitkat using CWM recovery (again, I made sure I flashed the correct version of cwm recovery for my model first before flashing the new rom). CWM got flashed successfully and replaced my default android recovery system and it worked too (although screen would flicker while tool operated). Everything was perfectly going on till now. I was feeling happy to finally run kitkat on my 4 year old phone. My current OS was booting normally, I could go into CWM recovery, fastboot mode as well.
Now, here's where I made a mistake probably! :
I UPDATED CWM RECOVERY TO V6 JUST BEFORE BEGINNING THE FLASHING PROCESS FOR ANDROID KITKAT FOR MY MODEL. Then while flashing, I first decided to test the backup and restore function of cwm recovery. I backed up and restored my current version using cwm. It backedup without issues. But while restoring, it introduced some errors. (yeah, I didin't know cwm reformated the wrong partition instead of the boot partition while restoring the boot image!!! )
Now, my cwm recovery is gone, fastboot mode is gone.... heck... even battery doesn't show up as charging. I tried to press vol up + power button but nothng happens. It doesn't give any vibration feedback after the press. Same for just power button press.
Is there any chance of recovery at this stage??
I know cwm f****d up my phone's boot partition. Also, I searched for solutions to this problem as well here and found the article "How to revive dead Karbonn A9+/CM Flare after JB update". Yes, I tried the Qualcomm HS-USB QD Loader 9008 driver and QPST.2.7.374 tool on 32 bit windows xp (as problems were reported on 64 bit and windows 7 for the above mentioned driver installations, I had to take further pain and install 32 bit windows xp on my pc's second hard disk just to succeed in installing drivers for unbricking my phone..... as I use windows 7..... talk about problem getting bad to worst.... ah!! ) I plug the phone with battery in it to my PC (after successful driver installations) but phone isn't detected in device manager....
I tried everything, I fully charged battery overnight.
Result?? .... my phone is still not showing anything on screen. It's dead. It's not even accepting to charge from the wall. Forget booting or going to recovery/fastboot mode.
I will never use cwm recovery again on any future smartphone of mine!!!! :crying::crying:
PLEASE HELP me with reviving my phone!!!
Or should I give up trying and just buy a new smartphone??
thanks in advance.

Ulefone T1 Bootloop - not able to access recovery mode

Hello all,
First of all, as a disclaimer: I am a total noob in this area. I just got my Ulefone T1, and tried to root it by installing TWRP and then installing SuperSU using TWRP. When I first installed TWRP, it worked and I got into the TWRP recovery menu. However, as the phone had to be wiped, I couldn't install the SuperSU zip anymore. I did a normal reboot to transfer the SuperSU zip to my phone, but when I then tried to turn my phone off and access TWRP, it went to normal recovery mode of my phone. As I wanted to start fresh off again, I went to the settings of my phone and did a factory reset silly.
Now, it is stuck in a bootloop where I can literally do nothing. I cannot access factory mode or recovery mode, all it does is just endlessly boot and turn off. I have managed to turn it off completely, but that's all I can do. Also, the battery is not removable.
Does anyone with a little more knowledge have a suggestion for me? Thanks in advance!
As an update, I got a suggestion to fully drain the battery, but that does not work either. I have tried connecting it to my PC, which is not working, but that was acting weird before. I guess it's just not possible?
did you work this out ? i am stuck in bootloop too ??????
Daviesjosh95 said:
did you work this out ? i am stuck in bootloop too ??????
Click to expand...
Click to collapse
I have no idea what software is necessary to do it for your device but you can flash stock rom, if it uses sp tool or something then download stock rom, use sp tool to flash it. Should be OK after that. As I am not familiar with this device I can't give you any other advice other than flashing stock rom.
Any solutions to unbricking/boot looping?
Have anyone found any solutions to unbricking phone??
Mine also did bootlooping after unlocking bootloader.
I was able to flash successfully but screen fussy and unreadable and not able to touch. I am able to hear but lines are on screen.
I have same problem, please, anyone help, I think I used wrong twrp image
Ulefone T1 Bootloop solution 2019.
I was able to fix the bootloop of my ulefone t1, just flash it with sp flash tool by following this guide:
1. Download the Stock Firmware on your personal computer.
2. Install the USB MTK Drivers (skip if you have it already installed).
3. Download and Launch the Smart Phone Flash Tool (SP Flash Tool)
4. Click the Scatter-loading button to navigate to the stock Rom you just downloaded.
5. Select the Scatter File from the extracted Stock Firmware on your computer.
6. Select the Download Only in the SP flash tool option
7. Click the Download button to start the Formating process.
8. Connect your device via USB to the computer>> holding volume + and volume – button of your device at the same time or holding power button only so that the flashing process will starting working
9. Patiently wait for your device to be formatted.
10. After the formatting is done, a Big Green button will pop up on the SP Flash to show that.
11. Unplug your device and boot it up.
12. If you have a boot loop after booting your device, boot into recovery mode and do a factory reset.
13. Voila, you are all good.
Very important step 8 of the guide.

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