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It will reinstall 4.4.2,practically a fresh copy of 4.4.2.It helps a lot in some cases.
Check with PC companion and sony update service for the update:
http://www.sonymobile.com/gb/tools/pc-companion/
http://www.sonymobile.com/gb/tools/update-service/
Keep us updated.
okay, it worked. Just that i got 4.4.2 and my friend got 4.4.3, im just conserned about other users got theire phone "Overheated" and when i tried to upgrade it "again" it says there is none. on both the phone and the PC.
There is no more than 4.4.2 for now,you should try to reinstall using sony update service:
http://www.sonymobile.com/gb/tools/update-service/
I downloaded that, and when it promted me to choose what model I got, there werent any z1 (C6903).
I'm really confused right now.
You should choose SOL23.
uhh, okay, going to try this now! Thanks!
Keep us updated.