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KX-TG4732B/KX-TG4733B/KX-TG4734B/KX-TGA470B
9 Service Mode
9.1. How to Clear User Setting (Handset Only)
Handset
Press ,,, simultaneously until a beep sound is heard. Then single handset is initialized.
(The contents of user setting are reset to factory default)
*Usage time is not cleared.