Yealink T48S Skype For Business Edition User Manual page 250

User Guide for the T48S Skype for Business phone
Tap Reset to factory.
2.
The touch screen prompts the following warning:
Tap the OK soft key.
3.
The phone begins resetting.
After reset, the touch screen prompts "Welcom Initializing...Please wait".
The phone will be reset to factory sucessfully after startup.
Note
You can also long press the
idle.
Reset of the phone may take a few minutes. Do not power off until the phone starts up
successfully.
248
soft key to perform the full reset function when the phone is