UPDATE
Now there is a way to fully upgrade ANY 4.0.4 device to 4.1.1
!!!! WARNING !!!!
THIS METHOD WILL WIPE ALL DATA FROM YOUR TABLET, INCLUDING INTERNAL MEMORY CARD (unless you carefully read all instructions)
You have been warned
Prerequisites: Acer A701 running 4.0.4 with unlocked bootloader and CWM recovery 6.0.1.1
Steps:
1) Download
1.1) Image for 4.0.4 http://www.multiupload.nl/L8GPOS9KLQ
1.2) Patch for 4.1.1 http://www.multiupload.nl/54LUR8HYHV
1.3) Image for 4.1.1 http://www.multiupload.nl/IEWOOJMHX0
2) Put patch 4.1.1 to an external SD card (not required, but helps a lot)
3) Boot to fastboot (adb reboot bootloader)
4) Install new image via running flash-ics.bat (that will give us a 4.0.4 image that will definitely upgrade to 4.1.1)
5) Rebooting to CWM (adb reboot recovery)
6) From within CWM install patch downloaded in 1.2
7) Reboot the device. 4.1.1 will start. Reboot it again to fastboot (adb reboot bootloader).
8) Unlock the bootloader (fastboot oem unlock)
9) Install the 4.1.1 image (flash-JBRoot.bat)
Reboot. Task complete.
ที่มา : http://forum.xda-developers.com
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