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(SOLVED) need help unbricking A500 with nvFlash

OP jitajt

3rd April 2012, 12:56 PM   |  #1  
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so I traded an older compaq laptop for this bricked Iconia A500 and they must have really borked it up because all the "normal" unbricking methods will not work, it will not pull the update.zip from the SD card about 10 -15 minutes in I get the LNX checksum error, same thing if I try to factory reset it hangs on Erasing cache... then back to the LNX checksum error. I have tried reflashing a stock EUU ROM in APX mode but it just hangs and wont update. I was able to get the UID by using the usb traffic sniffer and I created the SKB from the website. so now I can get it in APX mode but I am new to the Tegra tablets so I have no idea what I should see or do with the nvFlash, I am a pretty techincal guy and can usually figure stuff out by using common sense but I am sure I am missing something with this nvFlash program. I notice if I send the tablet a command with nvflash (like --sync) it will come back with the normal error but it will also cut off the usb connection and to send any more commands I have to restart APX mode (while in windows, I havent noticed it do that in ubuntu) if anyone has any experience in this and knows the steps to get it back from the abyss I would really appreciate it. I have tried following sc2k's thread on the checksum errors but it won't work because I fall under the "any other recovery" and he said to contact him or post for help, I contacted him 2 days ago and haven't got an answer yet, (I am sure he is busy) so I am going to ask for help here in the meantime.
Last edited by jitajt; 4th April 2012 at 12:53 PM. Reason: "I fixed the brick"
3rd April 2012, 01:29 PM   |  #2  
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I think you can try this way:

[downloading necessary files]:
1. pls refer to How to root stock 3.2 and download root-3.2.1-V4.7z


[actions:]
1. extract files from root-3.2.1-V4.7z to c:\a500unbrick
2. go to folder c:\a500unbrick and fined .pdf file with instractions. Read it carefully and follow it.

at the end of this process you will have os 3.2.1 with custom recovery.
Last edited by a.chursin; 3rd April 2012 at 01:31 PM.
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3rd April 2012, 01:51 PM   |  #3  
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Quote:
Originally Posted by a.chursin

I think you can try this way:

[downloading necessary files]:
1. pls refer to How to root stock 3.2 and download root-3.2.1-V4.7z


[actions:]
1. extract files from root-3.2.1-V4.7z to c:\a500unbrick
2. go to folder c:\a500unbrick and fined .pdf file with instractions. Read it carefully and follow it.

at the end of this process you will have os 3.2.1 with custom recovery.

Thanks I will look into it, but if it needs adb or booting from sd card its a no go because it won't read update.zip (lack of proper recovery image?) Nor can I use adb, the only way I can send commands is through APX mode.

Sent from my Galaxy Nexus using XDA
3rd April 2012, 02:49 PM   |  #4  
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it doesn't need adb or sdcard update.zip - it's "apx moode" way of flashing
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3rd April 2012, 04:08 PM   |  #5  
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Quote:
Originally Posted by a.chursin

it doesn't need adb or sdcard update.zip - it's "apx moode" way of flashing

thanks will try this when I get home from work, I found everything under the sun to unbrick except this way. so I am hoping this will work.
3rd April 2012, 10:57 PM   |  #6  
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still will not work
I have tried the PBJ20upgrade.exe and I know it says to use APX mode in there but it doesn't work as stated in the OP and that is why I said it needs to be with nvFlash, nothing else is working at all. it will just hang at 1/8th done for well over 20 minutes.
thanks for replying though and trying to help.

anyone have experience with nvFlash that can help?

this is how far it gets when I try using nvflash in the command line:

nvflash --bct flash.bct --setbct --configfile flash.cfg --create --odmdata 0xb00d8011 --bl bootloader.bin --sbk 0x45DC1E00 0x48A7F501 0xA7EE1103 0xB0512103 --go

Nvflash started
rcm version 0X20001
System Information:
chip name: t20
chip id: 0x20 major: 1 minor: 3
chip sku: 0x8
chip uid: 0x037c61c9434032d7
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: flash.bct
data send failed NvError 0x120000
setbct failed NvError 0x0
command failure: bootloader download failed

C:\Users\Jon\Desktop\Acer Tab A500\root-3.2.1\Image>
Last edited by jitajt; 4th April 2012 at 12:54 PM.
3rd April 2012, 11:32 PM   |  #7  
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GOT IT!!!
I got it!! I had to boot into Ubuntu and run the same nvflash command and it worked like a charm, I am currently sporting 3.2.1. now to get some ICS on this thing

thanks for your help a.chursin.
4th April 2012, 07:41 AM   |  #8  
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Your welcom
13th May 2012, 04:40 AM   |  #9  
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help!
Could someone please help me with this?? Im stuck with the green Acer screen. Bootloader is hosed, I can get it to APX mode, no adb, no recovery, no fastboot.....I think I can use NVflash to flash a recovery and then flash an update.exe, I just dont know the commands. When I try nvflash --sync, the nvidia APX driver in device manager just dissapears and I have to put the tablet back in APX mode.
13th May 2012, 08:31 AM   |  #10  
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Quote:
Originally Posted by cooki3monst3r77

Could someone please help me with this?? Im stuck with the green Acer screen. Bootloader is hosed, I can get it to APX mode, no adb, no recovery, no fastboot.....I think I can use NVflash to flash a recovery and then flash an update.exe, I just dont know the commands. When I try nvflash --sync, the nvidia APX driver in device manager just dissapears and I have to put the tablet back in APX mode.

How did u get yrself into this will need more info to help BUT
the green recovery screen suggests its the HC recovery image
If u r on HC then I have a feeling nv/fast boot only works on an unlocked b/l which 3.2 is not, but I'm not 100% on that
U can try an EUU based flash as u say apx mode is still available to u
Timmydeanv4 for gen2 stock, else EUU from vaches thread

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