Cisco Phone Factory Reset

Factory Reset – “1,2,3,4,5,6,7,8,9,*,0,#”. 

• Unplug the power from the phone.
• As you plug it back it, press and hold the “#” key.  If performed correctly, the Headset, Mute, and Speaker buttons in the lower right corner will start to flash in sequence.
• When those three buttons start flashing in sequence, enter the following code: 1,2,3,4,5,6,7,8,9,*,0,#.  You’ll notice that’s every button on the keypad in sequence from left to right, top to bottom.
• Phone will display “Upgrading” and erase the configuration.

Don’t worry if you press a key twice on accident.  The phone will still accept the code.  However, you do need to be quick about things.  The phone will only accept the factory reset code for 60 seconds after the Headset, Mute, and Speaker buttons start flashing in sequence.