He leído ésto en xda:
So, I found recovery.
1) connect USB cable to PC and Umi X2
2) Power off X2
3) VolUP + Power while Umi logo on white background is shown. Now pull out buttons and repeatly push Power.
4) Click Power for show recovery menu.
Usage:
VolUp is select button!!!
VolDown - down
Power - show recovery logo
It's possible to use signed update zip files from Internal memory card.
When I try to install h**p://androidsu.com/superuser/ RC version, it was OK, but on reboot is there old version still.
