I'm trying to downgrade my Xperia Z1 from (the horrible) KK update 4.4.2. to my stock 4.3 JB. I've tried flashing the following FTF's:
C6903_14.2.A.1.136_Generic Nordic NCB_1276-9897.ftf
C6903_14.2.A.0.290_Customized NCB 1276-9897 (Nordic Combined).ftf
All found here!
No one works. I keep getting bootloops (I can se the startup animation, then it restarts). I manged to get my phone working with using the orginal KK FTF (C6903_14.3.A.0.681_Generic NCB 1276-9897 (Nordic).ftf).
Could somebody please help me and figure out what the problem is? I've added my Software Info as an attachment.
Thanks for any replies!