Originally Posted by eng.hussam
It is demo device i got it from sony while i were working with them
Auch! Well.. you could try your luck and just send it to them and see what they do. Do not send it in to Sony themselves, but to an authorized repair center. They get paid for each phone they fix (by Sony), so some of them do not care about "trivial" stuff like these.
Or you can just call them a call and see what's up.
Sent from my C6833