Allora:
Ho rimesso GB
Inserito la Shendu (la versione con le gapps postata qui)
Avvio in Recovery Mode
wipe data
wipe cache
update from sdcard ----->
Finding update package...
Opening update package...
Verifing update package...
E:failed to verify whole-file signature
E:signature verification failed
Installation aborted.
inoltre su wipe data e cache dive -E:format_volume failed to unmount "/cache"