Airis T483 soft reset
Locate T483 RESET button under the battery cover / stylus. Press RESET hole (+ press and hold POWER button.)
Airis T483 hard reset
With the phone turned off, press and hold POWER ON key + WIN key + OK key.
Your PDA will be revert to factory default settings. All data and settings will be lost! Pls back up all your important data before doing this procedure.