To find Sony Ericsson Remote Update Service in your phone, navigate to “Settings” in the main menu and find “Update Service” in the “General” tab. Choose “Search for update” and press “Select”. Then follow the instructions on the screen.
The process has three simple steps:
When the download is finished, the phone will automatically restart and your phone is updated with the latest software. Please note that it may take up to 20 seconds for the phone to start the first time after update

