You will need a working TFP server to update the firmware.
- Obtain the latest firmware for your device from Cisco Support at http://www.cisco.com/support
- Extract the archive and copy the [filename].bin file to be called spa.bin and place it in your TFTP servers' root directory
- In a web browser on the same LAN as the phone visit http://[PHONE IP ADDRESS]/upgrade?tftp://[TFTP SERVER IP]/spa.bin
- Do not power cycle/reboot the phone it will automatically reboot once the firmware has been updated
Please note the filename must be named
spa.bin otherwise the upgrade will fail.