Ciao...
Traductione inglese :
you must have a ext SDCARD with min 500mb FREE
1- backup + delete partition + resize partition
2- delete partition + resize
3- restore partitions form 1 ( data will be lost)
4- fix wifi & buletooth
q- quit
Wish these help you.
Download :
https://drive.google.com/file/d/0Bxn...ew?usp=sharing
Thanks to xda and nubia official forum for the work.
I'm just sharing, this is not my work, but this is working