Yealink SIP-T54S Administrator's Manual page 191

To reset the phone to factory via phone user interface:
Press Menu->Advanced (default password: admin) ->Reset Config.
1.
Select Reset to Factory Settings.
2.
The LCD screen prompts "Reset to factory setting?".
Press the OK soft key.
3.
The LCD screen prompts "Resetting to factory, please wait...".
The LCD screen prompts "Welcome Initializing...please wait".
To reset the phone to factory via web user interface:
Click on Settings->Upgrade.
1.
Click Reset to factory to reset the phone.
2.
The web user interface prompts "Do you want to reset to factory?".
Click OK.
3.
After startup, all configurations of the phone will be reset to factory defaults. So the value of
the parameter "static.auto_provision.custom.sync" will be reset to 0. Configurations in the
001565770984-local.cfg file saved on the IP phone will also be cleared. But configurations in
the 001565770984-local.cfg file stored on the provisioning server (tftp://192.168.1.211) will not
be cleared after reset.
Configuring Basic Features
165