[Q] Tablet bricked checksum error and now stuck in apx

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By arno911, Junior Member on 25th March 2013, 08:11 PM
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Hello,
First excuse me for my english, my post here is my last chance, i've posted in a french forum but nobody could help me.

My tablet was in a stock rom ics, i've flashed it manually a few days after the release of ics and since i never flash it again.
A day i put my tablet in standby, the day after it was shutted down, when i tried to turn it on i've got this message : "Secure boot : image LNX checksum fail!".
So i tried to turn it on in recovery power button/vol- i've got this message :"Secure boot : image SOS checksum fail!".
I used a tutorial founded here to find my cpuid (ubuntu method) after that i used the "EUUs_SBK_Acer_A500_1.016.05_COM_GEN1" tool to repair my tablet, everything ok, i've got the "PASS" message at the end. So i shut it down and on and now my tablet will boot only in apx mode.

Please help me to unlock my tablet. Thanks.
26th March 2013, 09:00 PM |#2  
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Re: [Q] Tablet bricked checksum error and now stuck in apx
You should be able to run that EUU again,
Turn tab off and enter apx mode manually using the reset/power button combo. Hook up to yr pc and run the EUU.
Or
use apx flash tool by blackthund3r using bundle 17 from the bundle market inside the app itself. This will flash the unlocked v8 bootloader and cwm so u can flash any custom ics/jb rom. The EUU u used will take u back to stock Acer 3.1.

Good luck!

Sent from my GT-I9300 using Tapatalk 2
26th March 2013, 10:55 PM |#3  
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Thank you for your answer.

I've tried your second method with apx flash tool. It's blocked here : "Flashing Bootloader (EBT) stage two - uploading image..." and the nvflash command prompt shows "Nvflash started [resume mode]" what can i do ?
27th March 2013, 06:34 PM |#4  
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Re: [Q] Tablet bricked checksum error and now stuck in apx
Go to the root guide in my sig.
D/l babsector.rar follow these steps here posted by danny2 http://forum.xda-developers.com/show....php?t=1624645.....

Sent from my GT-I9300 using Tapatalk 2
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27th March 2013, 07:30 PM |#5  
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I've tried your post 3 in your Beginners Guide - Rooting, Flashing, Unbricking.
Here is the result :
Code:
C:\Users\Arnaud\Desktop\Restore A500\nvflash-A500>nvflash --bct bct.bct --setbct
 --bl bootloader.bin --configfile flash.cfg --odmdata 0x300d8011 --sbk 0xE933000
0 0xFF25F106 0xC7061504 0x7C302103 --sync
Nvflash started
rcm version 0X20001
System Information:
   chip name: t20
   chip id: 0x20 major: 1 minor: 3
   chip sku: 0x8
   chip uid: 0x0288414542c0d0d7
   macrovision: disabled
   hdcp: enabled
   sbk burned: true
   dk burned: true
   boot device: emmc
   operating mode: 4
   device config strap: 0
   device config fuse: 0
   sdram config strap: 0

sending file: bct.bct
- 4080/4080 bytes sent
bct.bct sent successfully
odm data: 0x300d8011
downloading bootloader -- load address: 0x108000 entry point: 0x108000
sending file: bootloader.bin
| 714385/714385 bytes sent
bootloader.bin sent successfully
waiting for bootloader to initialize
bootloader downloaded successfully
failed executing command 25 NvError 0x120002
command failure: sync failed (bad data)
bootloader status: partition table is invalid, missing required information (cod
e: 14) message: nverror:0x4 (0x4) flags: 0
Edit : After that i used Babsector, run A501 A.bat -> everything ok, reboot my tablet still in apx mode impossible to enter recovery, run A501 B.bat -> everything ok but the same problem...
But after i run nvflash and flashed a new bootloader, recovery, new boot with no error but i'm still stuck in apx mode.

Edit2 : I retried the "EUUs_SBK_Acer_A500_1.016.05_COM_GEN1" tool : I've got the Pass message but below in red "Secure boot : image LNX checksum fail!". And when i reboot still stuck in apx.
27th March 2013, 10:40 PM |#6  
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Re: [Q] Tablet bricked checksum error and now stuck in apx
I don't have much time atm, will post later...but u need to flash an ics rom and do the wipes in between running the 2 bat files...did u do this?

Yr issue is two fold. Being stuck in apx and having the checksum error. And also a partition error...mIt will be a matter of trying the tools until it finally works..it does not sound like a hardware fault, so keep trying....

Oh, Ubuntu works when windows won't...u can run the nvflash command direct from there, see lcd047 solution in cpuid guide.

And you must put yr tab in apx mode using the button combo,

Sent from my GT-I9300 using Tapatalk 2

---------- Post added at 10:40 AM ---------- Previous post was at 10:33 AM ----------

[QUOTE=arno911;39637047]
command failure: sync failed (bad data)
bootloader status: partition table is invalid, missing required information (cod
e: 14) message: nverror:0x4 (0x4) flags: 0
[/CODE]

The 0x4 error....check yr cpuid
Make sure the boot recovery drivers are also installed. ...dl the mini sdk zip in the first post of the cpuid guide
28th March 2013, 01:15 PM |#7  
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Quote:
Originally Posted by dibb_nz

[...]u need to flash an ics rom and do the wipes in between running the 2 bat files...did u do this?

No i've just launched the 2 bat files. With what tool should i flash the ics rom ?

Quote:
Originally Posted by dibb_nz

Oh, Ubuntu works when windows won't...u can run the nvflash command direct from there, see lcd047 solution in cpuid guide.

I will try everything under ubuntu now.
Edit : I didn't find how to run nvflash under ubuntu...

Quote:
Originally Posted by dibb_nz

And you must put yr tab in apx mode using the button combo

Can you explain me this method ? Before i was stucked in apx mode i entered this mode by pressing the reset button + power button 3 seconds. And now i didn't even need to press the reset button my tablet boot on directly in apx mode and is recognized so in windows.

Quote:
Originally Posted by dibb_nz

The 0x4 error....check yr cpuid

How can i check it ? I got it under ubuntu the only method possible for me.

Quote:
Originally Posted by dibb_nz

Make sure the boot recovery drivers are also installed. ...dl the mini sdk zip in the first post of the cpuid guide

I don't know how to do that... I have downloaded the mini sdk zip what should i do with ?


Edit : I tried with "V8-UNL-ICS-HC-bootloader-MULTI-cwm" and have a new error maybe it can help...
Code:
   **********************************************************
   *   Press any key when your A500 is in bootloader mode   *
   **********************************************************
Appuyez sur une touche pour continuer...
Flashing HC-Bootloader...
Nvflash started
[resume mode]
Formatting partition 4 please wait.. Command Execution failed cmd 13, error 0x12
0002
FAILED!
command failure: format partition failed (bad command)
bootloader status: unknown operation (code: 1) message:  flags: 0

Nvflash started
[resume mode]
28th March 2013, 09:17 PM |#8  
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Quote:
Originally Posted by arno911

How can i check it ? I got it under ubuntu the only method possible for me.

The SBK is fine.
If it was not, nvflash would fail already on getting the system information.
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28th March 2013, 10:04 PM |#9  
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Code:
 **********************************************************
   *   Press any key when your A500 is in bootloader mode   *
   **********************************************************
Appuyez sur une touche pour continuer...
Flashing HC-Bootloader...
Nvflash started
[resume mode]
Formatting partition 4 please wait.. Command Execution failed cmd 13, error 0x12
0002
FAILED!
command failure: format partition failed (bad command)
bootloader status: unknown operation (code: 1) message:  flags: 0

Nvflash started
[resume mode]
Flashing HC-Bootloader???????

Next thing, are u putting your tab in apx mode before you do this???
"...If your tab does not dispay text like "Acer Iconia a500 Download Mode then your tab is not in "apx mode"

i know all thes modes are confusing, but your tab must display "download mode" for the flash to be successful.

There is a great solution recently posted by another user, who like you, got stuck in apx mode....he used nvflash with ubuntu and has written a post on how he went about it....http://forum.xda-developers.com/show...1#post39673261


Put your tab in APX Mode

You enter APX mode by holding down the Reset button(with paper clip).
Do not release it.
Hold down power for 3 secs and then release it.
After another second, release the reset button.

Your Windows PC should then detect your device and install the APX driver. You should then have an APX USB device installed.

If you do not have an APX USB device listed in your system tray, you cannot proceed.

The screen of your tablet is black and the Power Light is ON.
28th March 2013, 10:14 PM |#10  
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Quote:
Originally Posted by dibb_nz

There is a great solution recently posted by another user, who like you, got stuck in apx mode....he used nvflash with ubuntu and has written a post on how he went about it....http://forum.xda-developers.com/show...1#post39673261

Yes i've just saw it and try. But the same error occured :
Code:
Nvflash started
rcm version 0X20001
System Information:
   chip name: t20
   chip id: 0x20 major: 1 minor: 3
   chip sku: 0x8
   chip uid: 0x0288414542c0d0d7
   macrovision: disabled
   hdcp: enabled
   sbk burned: true
   dk burned: true
   boot device: emmc
   operating mode: 4
   device config strap: 0
   device config fuse: 0
   sdram config strap: 0

sending file: bct.bct
- 4080/4080 bytes sent
bct.bct sent successfully
odm data: 0x300d8011
downloading bootloader -- load address: 0x108000 entry point: 0x108000
sending file: bootloader_apx.bin
| 714981/714981 bytes sent
bootloader_apx.bin sent successfully
waiting for bootloader to initialize
bootloader downloaded successfully
failed executing command 25 NvError 0x120002
command failure: sync failed (bad data)
bootloader status: partition table is invalid, missing required information (code: 14) message: nverror:0x4 (0x4) flags: 0

Quote:
Originally Posted by dibb_nz

Flashing HC-Bootloader???????

Next thing, are u putting your tab in apx mode before you do this???
"...If your tab does not dispay text like "Acer Iconia a500 Download Mode then your tab is not in "apx mode"

Yes my tab was in apx mode at this moment.
29th March 2013, 08:20 PM |#11  
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How to know if the problem is not hardware, I'm starting to lose hope...
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