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  • 1 Post By VelosCohagen

Thread: Bricked A501 and no CPUID

  1. #1
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    Bricked A501 and no CPUID

    Hi guys!

    I have a problem with my A501 with ICS! I watched a movie when it crashed and was unable to boot again. Then it booted into recovery mode which terminated without any problems.
    When i boot my tab now it shows the message "Boot verified failed ...". Then i tried to downgrade to "Acer_A501_1.309.02_COM_GEN1" using update.zip but the problem stays the same.

    My BIG problem is that i don't have the CPUID or a backup and never connected the tab in apx mode to get it with USBDeview.


    Is there an other possibility to get the CPUID or to flash a ROM using update.zip method?


    Thanks in advance!

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  3. #2
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    Re: Bricked A501 and no CPUID

    You probably need to flash what you had before the issue. IG that doesn't work I don't know what else you could try.

    .........TPT'd From my SGS3

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  4. #3
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    That sounds not so good! I bought the tab used with ICS already flashed...

    You mean i should try different images?

    Is ther an other possibility to obtain the CPUID or SBK, e.g. by opening it looking if it is written somewhere?

    EDIT: When does the SBK change? Only when i update from HC to ICS or on every update?

    EDIT2: I found the serial no of the tab (XEH6PEN0231340869A1500). Does anybody know if the last characters are the CPUID?

    Thanks in advance!
    Last edited by pgebi; 03-19-2013 at 02:21 PM.

  5. #4
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    The serial is not your cpuid. And it never changes because it's coded into the hardware. SBK is generated out of the cpuid.

    Read this to obtain your cpuid:http://forum.xda-developers.com/show....php?t=1751978

    You will have to use a 64 bit Linux to get your cpuid. I tried out this method some months ago and it works.

    Gesendet von meinem GT-I9300 mit Tapatalk 2
    pgebi likes this.
    Acer Iconia Tab A501 64GB
    FW: Tegraowners JB MR2 ROM v4 (Android 4.3.1)
    Recovery: thor touch recovery 1.8.1
    Bootloader: Skrilax_CZ's bootloader V9

  6. #5
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    I tried the c program under Ubuntu 64, but without luck.

    I booted the Tab into APX mode: connected the tab with the pc and power + reset for 4 sec.

    lsusb gives me the following device: ID 0955:7820 NVidia Corp.

    But when i run the apx program it prints: Error: Failed to open device!


    Is the tablet in APX mode or is this a different mode?

  7. #6
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    Tab should go in apx mode when holding reset and then while holding reset press power button for about 4 seconds. Then release power button and then reset button. Then power button should light up white while display stays dead.

    Then you are on apx mode.

    I used open suse to try this method out.

    In the xda thread is written that you must install some additional software packages, don't forget that. And then it doesn't work on every PC. I have to use my notebook for this method to work because it doesn't work on my PC.
    Seems to depend on mainboard's chipset.

    Gesendet von meinem GT-I9300 mit Tapatalk 2
    Acer Iconia Tab A501 64GB
    FW: Tegraowners JB MR2 ROM v4 (Android 4.3.1)
    Recovery: thor touch recovery 1.8.1
    Bootloader: Skrilax_CZ's bootloader V9

  8. #7
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    Quote Originally Posted by VelosCohagen View Post
    Tab should go in apx mode when holding reset and then while holding reset press power button for about 4 seconds. Then release power button and then reset button. Then power button should light up white while display stays dead.
    This is exactly what i did. Further i installed all packages listed in the XDA thread and was able to compile the apx program without any compiler/linker error.

    Later this evening i will try out your seggestion to use a different computer/laptop.

    UPDATE: I tried two different laptops but had no luck. I got always the same error message "Error: Failed to open device!"

    Is the device ID 0955:7820 correct for an A501 in APX mode?

    UPDATE 2: I took a look at the apx tools source code and saw that it is the correct id, as the tool tries to open a device with the same ID.

    Does anybody have a clue what is going wrong?



    EDIT: I finally got my CPUID :-)!!! I did not know that i have to run the apx program as root....

    BIG thanks to everybody for your help!



    Thanks!
    Last edited by pgebi; 03-24-2013 at 01:08 PM.

  9. #8
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    Quote Originally Posted by pgebi View Post
    EDIT: I finally got my CPUID :-)!!! I did not know that i have to run the apx program as root....
    Hello,

    Can you please tell me on how you ran the apx program as root. Also, please let me know what tools I need. Thanks a lot in advance!!


 

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