Yealink #

1. Press and hold the OK button until the message Reset to factory? appears
2. Press Yes
3. Once it restarts, the phone will be factory reset. The default password will be admin.

Yealink via YMCS #

1. Under Device Management, select the Phone Device option.                                                                                      
2. After selecting Phone device, it will list the devices that you currently have. Click the Diagnosis Icon under the Operation Column.
3. Scroll to the button Reset to Factory
4. The Phone will reboot and will still pull the configs on your RPS