How to easily unlock bootloader and root Acer Iconia A1-811 tablet with Android KitKat 4.4.2

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First, download and extract 'A1-811' archive from here, here or here. This is very easy, it only takes 5 minutes, just read carefully and follow  the instructions. If you have Acer Iconia A1-810 tablet then read this article.

Attention! Author of this guide is not responsible to any damage you got when unlocking! Only for 4.4! Warranty will void! You won't be able to flash original Acer updates!

Installing the driver
1. Find 'Drivers' folder in the extracted archive. Disable signature enforcement if you're on Windows 8 / 8.1.
2. There are two executable files:
2.1 Run install_driver.exe as Administrator if your OS is 32-bit.
2.2 Run installdrv64.exe as Administrator if your OS is 64-bit.
3. Wait 2 minutes. There's no feedback from installer.
4. Reboot PC and connect turned-off tablet to it. New drivers may be installed.

My PC has Windows 8.1 Pro x64 and everything worked just fine.
 

Preparing to serious work
1. Backup all your data!
2. Back-up all your personal data and MAC addresses
3. Charge your tablet on 100%!

Unlocking bootloader and installing CWM 6.0.5.0
1. Download an archive and unpack it in short path, for example in C:/
2. Launch "/SPFT/flash_tool.exe".
3. Load scatter from "/811 Unlocking and CWM/".
3.1 If Rescue folder is being used, load scatter from "/Rescue/".
4. Press Window - Write Memory. One more tab will appear, open it.
5. Press "Open RAW Data...", choose "/811 Unlocking and CWM/secuoff.img".
6. Memory type: EMMC.
7. Start Address: 0x3D80000.
8. Copy "File Size (bytes)" to Container Length field.

9. Press "Write Memory".
10. Connect your turned-off tablet to PC.
11. Progress bar will fill with red, then with dark green.
12. After this you will see a green circle.
13. Disconnect the cable. DO NOT try to turn your tablet on!
14. Go to "Download" tab.
15. Check files:
PRELOADER "/811 Unlocking and CWM/preloader_unlock.bin"
RECOVERY "/811 Unlocking and CWM/recovery.img"
If you are using Rescue folder:
PRELOADER "/811 Rescue/preloader.bin"
RECOVERY "/811 Rescue/recovery.img"
SEC_RO "/811 Rescue/secro.img"
16. Press "Download" and connect the cable again.
17. Progress bar will fill with red, then with purple, then with yellow.
18. After this you will see a green circle.
19. Disconnect the cable, wait 5 seconds and try to turn it on!
19.1 If all was booted OK, try to boot in CWM.
19.2 If A1-811 is not reacting to Power button, then run Guide #3 using Rescue folder.
19.3 Stuck on Acer logo? Press Reset and retry!

Root Acer Iconia A1-811 tablet

1. Copy provided 'UPDATE-SuperSU-v2.02.zip' to a micro SD card. Insert the card into the tablet.

2. Reboot the tablet into CWM (turn it off, press together Power On & Volume+ buttons)

3. Install UPDATE-SuperSU-v2.02.zip from CWM.

4. Restart your tablet. You're done! 

 

 

All credits go to Fire Diamond @ XDA (and to the others: mr.bin @ 4PDA, Calingo @ XDA, Vache @ XDA, Shreps @ XDA, swing4thefence @ XDA)