Yealink T48S Skype For Business Edition User Manual page 249

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.
T48S Skype for Business phone can be also upgraded from the Skype for Business Server. For
more information on how to upgrade the T48S Skype for Business phone from the Skype for
Business Server, refer to
How to reset the phone?
Generally, some common issues may occur while using the phone. Your system administrator
may ask you to reset your phone to factory configurations after you have tried all
troubleshooting suggestions but still do not solve the problem. This operation will delete all
your personal configuration settings, and reset all settings to the manufacturer default setting.
Note
Check with your system administrator if you want to keep some personal settings before
resetting your phone.
To reset the phone via phone user interface:
Tap Menu->Setting->Advanced (default password: admin) ->Reset Config.
1.
Updating Phone Firmware from Microsoft Skype for Busniness Server
Troubleshooting
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