Step 1: Return to fastboot rom
Using Intel Phone Flash tool, flash FASTBOOT rom using only the 'update' method.
It says "Unlock device" when executing "fastboot.exe" "-s" "A3P449980EC6" "oem" "verified"` command;
press YES
Step 2: Move to dev rom
After initial config, copy dev ROM into pad
Apply this update using Updater App
Step 3: Unlock
Enable USB DEBUG and OEM UNLOCK
adb reboot booloader
fastboot oem unlock -> yes [this delete all user data]
fastboot reboot
At ERROR CODE is 03, press Volume UP to boot to system
Step 4: Flash TWRP
Do again initial config of Wi-Fi and Mi Account
Renable USB debug
adb reboot bootloader
fastboot flash recovery twrp.img
fastboot oem reboot recovery
At ERROR CODE is 03, press Volume UP I could boot in twrp.
Step 5: Flash Xiaomi.eu ROM
Allow system modifications
copy xiaomi.eu rom and Google Installer 2 into tablet
Install xiaomi.eu ROM
Wipe cache/dalvik
Reboot into system
ALL IS OK TIL NOW.
SO AFTER STEP 5 YOU SHOULD DO THIS:
1. Download this archive: https://pucina.dedyn.io:5001/fbsharing/vYv99uM1
2. Extract archive downloaded above to somewhere (let's say c:\adb, let's call it N1)
3. Download this image: https://pucina.dedyn.io:5001/fbsharing/pQxB7W8R
4. Put downloaded image to N1 folder
5. Connect pad to PC
6. In Windows explorer, when adb (N1) folder opened press Shift and right mouse button and select "Open command window here".
6. Boot into fastboot with buttons combination or write in black window "adb reboot bootloader"
7. When you tab in fastboot mode write in black window "fastboot flash data userdata.img"
8. Reboot your tab
THEN GO TO STEP 7 (root is not necessary but if you want...)
Step 6: Root
Instal SuperSu from TWRP, do a wipe cache/dalvik only then reoobt
Step 7: Install Google Apps
Execute Google Installer 2 to install Google Apps.
Installer fails, again.