On the keypad press the following...
(old master code) wait for green light
press and hold AL key until multiple beeps are heard. this puts you into program mode.
TO ENTER NEW MASTER CODE press the following keys:
hi,
If u want to reprogram ur hndset than the only way is to go to sony service centre get the service done of ur ur hndset by them.
Thanks
Gizmo1
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