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You should first try a software repair:
http://www.sonymobile.com/gb/tools/update-service/
If you downgrade,you might have problems with validating warranty afterwards.
@alexdon wrote:You should first try a software repair:
http://www.sonymobile.com/gb/tools/update-service/
If you downgrade,you might have problems with validating warranty afterwards.
before that try reset to factory
SUS will do a hard reset and a software reinstall.
Good,make sure the phone has at least 60% battery.