you can try to "reset all" your phone in setting menu,if it don't work then download "sonyericsson pc suite" to your computer and put your phone in "pc mode" as "pc suite" works only in this mode then can repair the phone or you can simply update your phone by your computer.As to connect your phone with your computer is concerned you should try to connect the usb cable more care fully because when SE phones gets little old then they start this kind of problems and computer shows the notification "usb unrecognized" when you connect to computer.
