SOURCE: MASTER RESET CODES FOR SONY ERICSSON
Here are the Master Reset codes for your phone.
Master Reset / Codes
Accessing the Service Menu - Move
joystick right, press * key, move joystick left twice, press * key, move
joystick left, press * key.
Checking Firmware Version - Move joystick right,
press * key, move joystick left twice, press * key, move joystick left, press *
key, press 1 key twice.
Show IMEI # - press * key, press # key, press 0 key,
press 6 key, press # key
Manual brightness adjustment - While in camera mode,
press and hold * key and move joystick to lower brightness, press and hold 0 key
and move joystick to increase brightness
Quick ScreenSaver - Pressing # and *
at the same time
Show screensaver and lock keypad - press * and lock
keys
*#0000# - Reset language back to english
Hard Reset -Hold power for
10 seconds
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