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Thumbs up Recovering an Acer A200 and sharing

22nd April 2014, 08:28 PM   |  #1  
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Join Date:Joined: Apr 2014
Even being a SW and HW developer for a long time, I did had to spend some time to learn all the buzzwords in the "Android rooting" world to recover my Acer A200 tablet, so I'm sharing to save other people time:

My kid tried to guess the gesture password to play in my tablet, I don't know how many times, locking my Acer A200.
I tried google recovery, but the WiFi was off (and I could'nt turn on as the tablet was locked), so I went to the web to find a solution.
Factory reset seemed like a good one (turn device ON pressing power+down vol and switching the orientation key), it boots, then shows 'erasing user data', then hangs with an error:
Unrecoverable bootloader error (0x19000008)
Now the device is not booting, it get stuck on Acer logo after animation...

So I tried to use ADB to revert the damage, as indicated in one forum, but USB debug mode was not active when I did the factory reset.
ADB installation itself is unecessarily complicated, and as I cannot find a way to list the device in linux+adb ($>platform-tools/adb devices), even adding it to: /etc/udev/rules.d/51-android.rules (obtained with lsusb)
SUBSYSTEM=="usb", ATTR{idVendor}=="0502", ATTR{idProduct}=="337d", MODE="0666", GROUP="plugdev"
It seems android isn't even booting to enable the debug bridge.

So I went to the "fastboot" as last resource (reboot using power+vol.down+switch.toggle), and did the command:
android-sdk-linux> platform-tools/fastboot oem unlock
I selected the "open lock" image and rebooted, now it shows: Bootloader v0.03.06-ICS(UnlockMode), but hangs in the same point.
So I downloaded a stock image from:
Burned it using:
$> platform-tools/fastboot flash recovery /home/gaglocal/backup/acer/stockrecovery.img
	sending 'recovery' (6144 KB)...
	OKAY [  1.882s]
	writing 'recovery'...
	OKAY [  2.689s]
	finished. total time: 4.571s
Same status after reboot.
So I've downloaded 'stock ROMs' from:

But when I try to write using fastboot:
error: update package has no android-info.txt or android-product.txt
So it seems this ROM is just for SDcard update (ie.: place the zip file as in the root of a fat32 sdcard, then boot using power+vol.down to perform the recovery process with it) but it fails and shows a dead android with a red triangle in the belly, not funny.

As the error that shows up when trying to issue the factory reset is after "erasing user data" I decided to do:
platform-tools/fastboot erase data
	erasing 'data'...
	FAILED (remote: (00030003))
	finished. total time: 0.167s
This indicates this tablet has some HW misconfiguration issue. As some posted, I repeated the proccess a few times - no luck.

So I wrote the CWM image from this forum, rebooted, and performed the sdcard recovery method again.
Same dead droid icon...

Finally I decided to erase the flash again, starting with the cache partition, using fastboot:
platform-tools/fastboot erase cache
	erasing 'cache'...
	OKAY [  1.452s]
	finished. total time: 1.453s
Finally, rebooted with the "factory reset" again and it worked!

At least i learned a lot without having to go to the Nvidia very-low level flashing process
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