[Solved - 3.1 OTA update working!] Back to stock and backup for newbies TUTORIAL
This tutorial is made to help those getting an Iconia for the first time as well as those who lost/didn't backup before going to custom ROMs.
We will try to help you using more than one variant #1, #2 etc to backup and restore your tablet. If you're new stick to the #1s in the first post. If you know a little Android and a little Linux, head to the second post.
Acer does not provide any full-restore ROMs at the moment so your best option is to create your own backup in case something goes wrong.
The ultimate goal is to help users restore their OTA (over the air) update function, aka. get the OS as fresh and clean as it was the day it came out of the factory.
Help us help you! The parts of the tutorial that aren't ready or require your attention are marked in RED. If you got:
A new tablet, never flashed with a custom rom, share your original backup with US, you will need it anyway once you decide to experiment!
A new tablet, never updated, share your Firmware and "Operated Countries" (on the back of the box) so we know what stock ROM belongs to which countries or continent.
Knowledge and the will to share it!
Before you start!
Don't be afraid of rooting, it will not break your OTA (un-rooting is a piece of cake) updates and it is essential to do a proper backup!
Back up your user files from music to documents and save games or you might lose them!
When everything fails > Privacy > data reset is a good way to start fresh. Best to use it when trying something new.
Always unfreeze/restore system APKs like telephony etc before formatting/soft resetting (not to be confused with turning on and off again) your tablet.
Any .zip on the micro-sd card will be automatically flashed on POWER & VOL-
Save Acer Recovery Installer, Root, your favorite file explorer on your desktop
Droid Explorer (PC app) can be a great tool to install apps from your PC
Before attempting to OTA update: un-root, make sure all system apps are in place, remove micro-sd, factory reset (some have reported success after these)
Get the right firmware (Full Package, thanks Vache), for your tablet, decrypt it and extract the update.zip
Put it on your micro-sd card. Shut down. Boot with power and VOL - pressed and it will automatically get flashed.
Did your tablet come with one of the following firmwares or maybe another one? (Settings > About tablet), tell us what countries/continent it is for by checking the back of the box for the "Operated Countries" label and posting it below:
select "ClockworkMod Recovery rev1.3.4 by thor2002ro"
click "Install Recovery Image"
click "Yes" when asked to backup the current image!!!
Reboot into CW recovery from the app or with VOL- & POWER
Create a full backup: "backup and restore" -> "Full Backup"
If your backup is a fresh stock-only (no previous custom roms flashed) one, please share it. It's located on your micro SD in clockworkmod/backup/[current date] <= This is the CWM folder we need!
Don't forget to restore the original recovery image to be able to install futher updates. Unrooting might be necesary depending on Acer.
Restoring to defaults via CWM #1
Full restore in CWM: "backup and restore" -> "Full Backup"
Enter Acer Recovery Installer and restore recovery.img!
Aditional restoring info
Remember: un-root, remove micro-sd, factory reset if it doesn't work.
Also don't have modified, removed or frozen system apps, wi-fi module, build.prop or any other OS file!
"dd" method in the second post is practical if you'll want to downgrade from a FW that has no root yet - still needs testing (eg. if you update to a future 3.2 you won't be able to go back to 3.1 or 3.0.1 until 3.2 is rooted, because CWM needs root, here's where ADB and "dd" can really come in handy!)
Updates of original Acer_A500_1.016.01_COM_GEN1
CWM backup successfully used by me, containing: Stock 1.016.01_COM_GEN1 OTA updated to 1.139.02. 1.139.02 is a "dud" - a FW update taken down by ACER that breaks updates; to solve this issue flash the update.zip(1.139.05) with the default acer bootloader (restore the original recovery.img from Acer Recovery Installer to get the default acer bootloader)
Creating a backup via ADB #2
If you're uncomfortable with ADB, this should work with Terminal Emulator +/- Busybox too. Just skip to step 4.
Or you can try the automatic backup tool, just fire it up and follow the instructions. Root and 1GB on the external SD required.
Get ADB + Java both for x32 even if you have windows on 64 bit!
So, a question... If the Restore function in CWM doesn't restore properly, does it backup properly? That is, if I manually restore the files that CWM made when it backed up, will it restore properly or did the backup miss something?
Current Devices: Samsung Galaxy Note II (N7100), Acer Iconia Tab A511
Past Devices (too many to list, mostly Acers!)
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