In order to reset your Yealink T46G to factory settings:
- Turn on the phone and wait until it has booted up
- Press the OK button until the phone asks you if you want to reset to factory settings
- Confirm the factory reset by pressing OK (i.e. the button on the bottom right of the screen, i.e. the rightmost button of the row of buttons just below the screen)
- Wait for the phone to reset