Steps to Update Cisco Phones Firmware

Prerequisites / Minimum Requirements

•       Cisco IP phone

•       Working network

End State / Outcome

• Cisco phone with an updated firmware, possibly fixing random issues.

How to Steps

1. Disconnect network cable, removing power to the phone.
2. Press and HOLD the pound key (#)
3. Plug in the network cable, providing power to the phone (while still hold the # key)
4. Wait until the buttons flash and release the # key.
5. Press the following keys in the listed order.

• 123456789*0#

6.        Wait until the phone is back up.

•       If the firmware is updating you could see a long period with no status displayed, leave it alone, this could take 5-10 minutes.
•       Eventually you will see the registering status.
•       You could see a reboot of the phone and a second registering status screen before the phone is back up.