There are times where you need to set the Cisco phone to factory settings. The process is quite simple
- step 1 is to power Off and On the phone
- One the speaker phone button on the right side of the phone blinks on and off
- Hit the # sign until all the buttons on the top right of the phone blink in order
- press 123456789*0# and this will reset the phone
Once the phone is reset, you will see the phone trying to connect the call manager and will get the proper firmware