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Author Topic: Tablet bricked?  (Read 2510 times)

Offline davidbrooke

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Tablet bricked?
« on: January 10, 2016, 12:25:55 AM »
Hello all!
I have a Sero 7 pro and I'm not sure if it is bricked or not.
Currently the following are the only possible outcomes:
1.When I boot up, I get the Hisense logo and small red text in the top of the screen that says: unrecoverable bootloader error (0x00000000).
2. When launching recovery (vol - and power buttons), I get the recovery logo and and small white text in the top of the screen that says: Booting failed.
3. When launching fastboot (vol + and power buttons), I get the fastboot logo but I can't get any adb devices when I execute adb devices on the computer.
Any ideas?
Thanks



Offline davidbrooke

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Re: Tablet bricked?
« Reply #1 on: January 10, 2016, 02:28:17 AM »
3. When launching fastboot (vol + and power buttons), I get the fastboot logo but I can't get any adb devices when I execute adb devices on the computer.
Ok I made some headway. I didn't have fastboot setup correctly on my computer, apparently. Now when I type "fastboot devices" I get:
Code: [Select]
~ $ fastboot devices
015d8bed0a0c0a18        fastboot
Moving forward, I have tried to load recovery, which worked:
Code: [Select]
~ $ fastboot flash recovery twrp2.8.1.0-selinux-flashable-sero7pro-20141015-EXT4.zip
sending 'recovery' (8102 KB)...
OKAY [  1.539s]
writing 'recovery'...
OKAY [  0.851s]
finished. total time: 2.390s
But when I tried to reboot into recovery, I get the recovery logo and and small white text in the top of the screen that says: Booting failed.
I tried to load a rom but had a formatting issue:
Code: [Select]
~ $ fastboot erase system -w                                                                                                                                               
erasing 'system'...                                                                                                                                                                         
OKAY [  0.257s]                                                                                                                                                                             
erasing 'userdata'...                                                                                                                                                                       
OKAY [  2.195s]                                                                                                                                                                             
formatting 'userdata' partition...                                                                                                                                                           
Erase successful, but not automatically formatting.                                                                                                                                         
File system type emmc not supported.                                                                                                                                                         
OKAY [  0.002s]                                                                                                                                                                             
erasing 'cache'...                                                                                                                                                                           
OKAY [  0.217s]                                                                                                                                                                             
formatting 'cache' partition...                                                                                                                                                             
Erase successful, but not automatically formatting.                                                                                                                                         
File system type emmc not supported.                                                                                                                                                         
OKAY [  0.001s]                                                                                                                                                                             
finished. total time: 2.672s
The "File system type emmc not supported" I think is the issue to resolve now.
Thanks

Offline LuckyMe

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Re: Tablet bricked?
« Reply #2 on: January 10, 2016, 07:16:20 AM »
Hi. And welcome to the forum.

Sorry to say, Yes. It's bricked.  With the error message you are seeing- unrecoverable boot error, it's not promising.  There aren't any roms for the sero7 pro that can be fastbooted. That's why you see that error message in fastboot about file type not supported.

2 things you can try...

Try booting to recovery using the temporary method and flash a rom already downloaded to sdcard. Or side loaded if you know how.

http://sero7forum.com/sero-7-root-hack-mod-and-development/fastboot-to-a-temporary-recovery-flash-backup-or-restore/msg8358/#msg8358

Or you can try using fastboot to flash a nandroid. If you have one.. You'll have to search xda for those instructions.

But again, with that error message, It's not promising.  I hope it works! Good luck!



A nandroid is a man's best friendainol Venus-Firomi v3.2
S7P DoPa Lollipop 5.1
Vidaa Pad 8 Oma V1.1

Offline davidbrooke

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Re: Tablet bricked?
« Reply #3 on: January 10, 2016, 01:03:28 PM »
Try booting to recovery using the temporary method and flash a rom already downloaded to sdcard. Or side loaded if you know how.

http://sero7forum.com/sero-7-root-hack-mod-and-development/fastboot-to-a-temporary-recovery-flash-backup-or-restore/msg8358/#msg8358

Using your suggestion above I was able to get recovery and KitKat installed and working again. Thanks!
I want to try to figure out what happened. The problem started when I tried to upgrade to Dopa6. I'll try to basically reproduce my steps.
1. I first installed the newest version of TWRP:
sero7pro-twrp287-dopa5-v1.3.zip
I installed through recovery and rebooted and got a recovery that would flash on and off but the cycle would be mainly be on.

2. I decided to get a new download of TWRP and install both recovery and Dopa6. This caused the state of which is in my 1st post.

Currently I have installed and working:
TWRP
twrp2.6.3.0-selinux-flashable-sero7pro.zip
KitKat
tt-4.4-20140225-Release13-m470.zip

Again thanks for the tip!

Offline LuckyMe

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Re: Tablet bricked?
« Reply #4 on: January 10, 2016, 01:33:41 PM »
You're welcome.. And I am excitedly surprised it worked!   ;D

I don't know what happened with twrp and marshmallow..

IF you have issues... Take a look at the marshmallow thread.  There is a zip that one is suppose to flash prior to downgrading back to kk or lollipop.  In theory, you shouldn't have been able to flash that kk without installing it first. Somehow you side stepped that. Maybe using recovery temporarily? IDK, but keep that in mind..

Have fun!

A nandroid is a man's best friendainol Venus-Firomi v3.2
S7P DoPa Lollipop 5.1
Vidaa Pad 8 Oma V1.1

Offline davidbrooke

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Re: Tablet bricked?
« Reply #5 on: January 10, 2016, 02:01:17 PM »
I may have an answer to my original problem.
I reviewed the Sero 7 Pro specs since I thought I might have to get another tablet. I saw that the external SD card max is 32 GB. I have been using a 64 GB SD card.
Originally I had used wireless to copied the Dopa6 and TWRP to the external SD card. This was when I had a corrupt TWRP and went through the same process of acquiring it again. I did the 2nd install of TWRP and Dopa6 which lead to the problem state which is in the 1st post.
When I followed your temporary recovery suggestion, I removed the external 64 GB SD card and copied files via my computer, then used it in the tablet. Which lead to the successful installation of TWRP recovery and KitKat.
So basically since the Sero 7 Pro is only rated for a 32 GB max SD card and I used a 64 GB SD card....I got a corrupt file on the 64 GB SD card when the Sero 7 Pro wrote to the 64 GB SD card. The Sero 7 Pro can read from a 64 GB SD card but not write to it.
I now have installed Dopa6 and TWRP 2.8.7 files and they are working as expected on the Sero 7 Pro.