Yealink T48G-SKYPE FOR BUSINESS EDITION User Manual page 252

User Guide for the T48G Skype for Business phone
Click Browse... to locate the firmware from your local system.
2.
Click Upgrade to upgrade the firmware.
3.
The browser pops up the dialog box "Firmware of the SIP Phone will be updated. It will take
5 minutes to complete. Please don't power off!".
Click OK to confirm upgrading.
4.
T48G Skype for Business phone can be also upgraded from the Skype for Business Server. For
more information on how to upgrade the T48G Skype for Business phone from the Skype for
Business Server, refer to
How to reset the phone?
Reset the phone to factory configurations after you have tried almost all troubleshooting
suggestions but do not solve the problem.
Three ways to reset the phone:
Full Reset: All configurations and userdata on the phone will be reset.

Configuration Reset: All configurations (e.g., account, call history) set on the phone will

be reset.
Userdata Reset: All custom data (e.g., ring tone) set on the phone will be reset.

Contact your system administrator before resetting the phone.
To reset the phone via phone user interface:
Tap ->Advanced (default password: admin) ->Reset to Factory.
1.
Select the desired reset option from the pull-down list of Reset Option.
2.
238
Updating Phone Firmware from Microsoft Skype for Busniness Server
.