AMLogic Tablets, 7033, 7035, 7065, 7060, and So On: Repair Tablet from SD Card

Discussion in 'Coby Generation 3 Development' started by vampirefo., Nov 8, 2013.

  1. alexzamp

    alexzamp Member

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    So you say that if I use Linux I can, through adb, replace boot.img and recovery.img even if I cannot activate USB debugging? If so, how can I do it?
     
    Last edited: Dec 24, 2013
  2. vampirefo.

    vampirefo. Senior Member Developer

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    Nope, never said that at all.
    Merry Christmas all, look at this again after the holidays.

    Sent from my SPH-D710 using Android Phone
     
  3. Slider2732

    Slider2732 Member

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    And Merry Christmas to you vampirefo, plus all here :)

    I believe the situation is that the tool needed to access adb just isn't around and Coby (nor AKAI) will release it. So the Windows guys were asked if they knew more. I could be wrong, but that's my take on it, rather than platform problems.
    Always troubling, is that Android is an open source platform and Coby can't care now for any rights to their methods, cos they've gone belly up. Short of a court order though, could Google help at all ?
    It all seems weird and bizarre.


    I decided to try another SDcard boot. An old card of 2GB has been troublesome recently in a digital camera and so I thought it could be repurposed. The 7033 specific files and the update from the Penta brand tablet were made into a .iso.
    The card may or may not boot, but it doesn't on the tablet so far.

    Say, wait a minute, what about Penta ? if that one is a clone/copy as well ?
     
  4. alexzamp

    alexzamp Member

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    Merry Christmas all. Hope to read again after the holidays. I'm sure something will come up.
     
    Last edited: Dec 27, 2013
  5. vampirefo.

    vampirefo. Senior Member Developer

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    Ok I finally got this fixed, I spent all day on and off on this, I finally said f_____ windows and went bad to bread and butter Linux. I wrote my own files to hack this bad boy, you guys that want to continue working on windows method of this can do so, as for me, Linux only method.

    Now my method can be used by windows users also, as I have made this as simple as possible. You will need adb setup and a sdcard, I use a card reader another android device would work also to transfer the stuff to sdcard.


    http://www.androidtablets.net/forum...t/64034-fix-bootlooped-coby-7033-tablets.html
     
    Last edited: Dec 28, 2013
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  6. mcclain_ts

    mcclain_ts Senior Member

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    Hey all! A belated Merry Christmas/Happy and Prosperous New Year wish to you all!(warm smilz) Haven't had time to get on here lately, as my son and ex-wife are here in Oregon for the holidays. Be well, be safe, and again, HAPPY NEW YEAR!!!
    Best regards always!(smilz)
    --------------------------------------------------------------------------------------------------------------------------------
    Vampire, ALL your hard work's looking great! I have a butt-load of reading/catching up to do!(smilz) Be safe now, and have a great New Year's!
     
  7. vampirefo.

    vampirefo. Senior Member Developer

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    Well this thread has ran it's course, we have accomplished our goals of being able to repair these tablets from sdcard.
     
  8. ayase.shiki

    ayase.shiki Member

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    -exec 'system/bin/sh' failed: No such file or directory (2) when i type in adb shell :help:
     
  9. vampirefo.

    vampirefo. Senior Member Developer

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    Means you have no system, could be many reasons, you modified your tablet, and system lost permissions, or you could have deleted system.
    Restore your back up or find a backup for your tablet.
    Which of the tablets in this thread do you have?

    Sent from my SPH-D710 using Android Phone
     
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  10. ayase.shiki

    ayase.shiki Member

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    actually, no, i just want to know the reason why its like that. my tablet is a rockchip MID7038, thanks for the help about answering the question :)
     
  11. Chanex

    Chanex Member

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    i have coby mid 8065 alogic after upgradin wrong firmware now red light only when insert charger
     
  12. coby7035

    coby7035 Member

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    Hi!
    I reopened work on the tablet...!
    And wanted to confirm that its got VIMICRO chipset inside.
    And now trying to reach the stage I was in a few weeks back :)
    Anybody got a MID7035 working again ?
     
  13. j_ds_au

    j_ds_au Senior Member

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    OK, based on this advice, I did as follows on my Pendo/Coby MID9762 :
    1. Extracted "recovery.img" using instructions you posted elsewhere here.
    2. Used your "extract_scripts.zip" under cygwin to decompress the above, seeking "recovery.fstab".
    3. Following the example in your "Coby_7065_fake_recovery.zip" file, I commented out the first few lines of the above.

    So the resulting "recovery.fstab" is as follows :
    Code:
    # mount point    fstype        device            device2
    #/bootloader    mtd        bootloader
    #/logo        mtd        logo
    #/aml_logo    mtd        aml_logo
    #/recovery    mtd        recovery
    /boot        mtd        boot
    /system        ubifs        system
    /factory    yaffs2        factory
    /cache        yaffs2        cache
    /data        ubifs        userdata
    /sdcard        vfat      /dev/block/mmcblk0p#  /dev/block/cardblksd#
    /media        vfat        /dev/block/avnftl9p1    /dev/block/avnftlj1
    
    So now I simply replace "etc/recovery.fstab" in "Coby_7065_fake_recovery.zip" to create a new "fake recovery" that I'll rename as "Coby_9762_fake_recovery.zip"?

    Joe.

    PS. Nope, it's not so simple. The ZIP fake recovery isn't accepted, it seems there's some sort of signing step required, I need to research further ....

    PPS. OK, I've found a few signing solutions, and selected this one as the easiest to use :
    Auto APK/ZIP Signer in Windows

    However, the end result still isn't accepted by the tablet. The problem seems to be due to the 'zipalign' step at the end. So reversing the order of the steps, we end up with a ZIP that isn't fully aligned but is accepted by the tablet (same as "Coby_7065_fake_recovery.zip" is). This is achieved by changing the "do2.cmd" file of this Signer package as follows :
    Code:
    setlocal EnableDelayedExpansion
    @ECHO off
    
    SET rom=%1
    
    copy !rom! x!rom!
    
    cd lib
    
    rem zip align
    zipalign -f 4 ..\x!rom!  ..\signed-!rom!
    
    rem sign the rom
    java -Xmx512m -jar signapk.jar -w testkey.x509.pem testkey.pk8 ..\signed-!rom! ..\signed-!rom!
    
    cd ..\
    del x!rom!
    

     
    Last edited: Aug 9, 2020 at 1:20 AM

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