hi, i have a SE Z750I, and it is locked and branded to fido, can i debrand a locked phone? would that also remove the lock?

by the way i have a unlocked SE K850I but wat program would i use to flash it? XS++ dosent work on it, and SE TOOLS 2 LITE dosent support K850I's

heres my trhread for the k850i help please

K850 help please read this - Top Sony Forums