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snappy1

I bootlocker my phone then i downgrade my phone to 4.1 from 4.3 using flashtools now i have decided to upgrade my phone again but when i try to upgrade my phone from update center it shows error always in intsallation....what is happening...pls help me to get rid from this problem

Hampus

I'm a bit confused, but if I understand you correctly you have unlocked the boot loader to downgrade your unit. If you have unlocked the boot loader, our standard programs such as PC Companion/Update Service or FOTA updates will not work as intended.

I suggest that you take a look at the following link in this case:

http://developer.sonymobile.com/services/flash-tool/