Yealink SIP-T23P User Manual page 143

2. Click Browse to locate the required firmware from your local system.
3. Click Upgrade to upgrade the firmware.
The web user interface prompts "Firmware of the SIP Phone will be updated. It will
take 5 minutes to complete. Please don't power off!".
4. Click OK to confirm upgrading.
How to reset the phone?
Reset the phone to factory configurations after you have tried all troubleshooting
suggestions but do not solve the problem. You need to note that all custom settings will
be overwritten after resetting. We recommend asking your system administrator for
advice before resetting the phone.
To reset the phone via phone user interface:
1. Press Menu->Settings->Advanced Settings (default password: admin).
2. Press or to scroll to Reset to Factory, and then press the Enter soft key.
The LCD screen prompts "Reset To Factory Setting?".
3. Press the OK soft key.
Troubleshooting
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