Reinstalling or upgrading the phone's firmware (Main and FS files) to fix software glitches or "White Screen of Death" (WSOD) issues.
Ensure your phone is charged to at least 50% before attempting any flashing to avoid bricking the device.
Some antivirus programs (like NOD32) may flag the executable as a false positive. It is often necessary to temporarily disable protection or add an exception. Flash and Unlock Sony Ericsson Guide | PDF - Scribd
Press and hold the (or sometimes the '2' and '5' keys) on the phone while connecting the USB cable to your PC.
For the computer to communicate with the phone in "Flash Mode," you must install the official Sony Ericsson Flash Drivers .