Please update the phone software by following the below,
Go to http://www.sonyericsson.com/support
Select the region and country where the phone was launch, and thereafter choose your phone in the drop-down menu.
If Update Service is available for your phone, you will find a link to the Sony Ericsson Update Service on this site.
Please note to select the right region where the phone was launched as there is a risk of damaging the phone by selecting the wrong region.
If the issue was not resolved please note that the unit has to be checked by Sony Ericsson Authorized Service center and also note that we do not have any authorized Service center or authorized distributor in Iran therefore and as per our records you can contact UAE Authorize Service provider mentioned below,
JUMBO Electronic +971 4 2851485
Axiom Phone Care +971 4 3210500
Cell U Com +971 4 2868664
Aptec Gulf +971 4 3341166