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KX-TG4771B/KX-TG4772B/KX-TG4773B/KX-TGA470B
9 Service Mode
9.1. How to Clear User Setting (Portable Only)
Portable
Press 2, 5, 8, simultaneously until a beep sound is heard. Then single portable is initialized.
(The contents of user setting are reset to factory default)
*Usage time is not cleared.
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