Thank you for the info, I found that the MIPad3 is unlock for default, so no need to unlock it.
So, this is what i did, very easy:
Install twrp
Reboot in twrp
Format data (must do)
Flash Xiaomi.eu ROM, saved in my usb PEN
Wipe
reboot....
That's that simple...
Xiaomi.eu flashed, 4GB Ram and...