I was wondering if anyone out there can help me with my Z1 C6903 . I updated flashed latest v4.4.4 ( C6903_14.4.A.0.108_1276_7937_R3C Customized SG ) with flastool from v.4.4.2 (C6903_14.3.A.0.757_Telstra ) with no probs . All working fine . The other day i wanted to downgrade back to original v4.2.2 and got the correct ftf file flashed but phone starts and it gets stuck on boot doesn't past sony logo thing . Now i tried a lots of different ftf files with same v 4.2.2 and same thing happens . Only versions that can be flashed is .757 or this latest .108 that will boot ok and work fine . Actually .757 gives me some android process stopped but at least it passes sony boot logo . I'm not sure what I'm doing wrong that's why I'm asking for any help out there . What I want to do is to return back to 4.2.2 to try something . I'm not happy with camera at all now reckon it was far better on 4.2.2 what it came with in the first place.