Yealink CP920 User Manual page 165

Config->Reset to Factory Settings.
Tap the Enter soft key.
2.
The LCD screen prompts the following warning:
Tap the OK soft key.
3.
The LCD screen prompts the following:
The phone will be reset to factory settings sucessfully after startup.
Reset of your phone may take a few minutes. Do not power off until the phone has started up
Note
successfully.
Welcome
4.
Initializing...please wait
Troubleshooting
155