Try updating the phones Software by using the SEUS (Sony Ericsson Update Service). And se if it works then! :)
Beacuse flashing your phone is not easy and you should not do it. Your warranty is bye bye! And it can brick. (Meaning: It will become as fun as a brick!). You wont be able to even start your phone up! But have fun! :)
Peaz.
Linus from sweden.
Linus, July 2010