Guide to update the Cisco Phone Firmware via CME

Guide to update the firmware:

Step 1, Download the Firmware
1) Download it via by Https://software.cisco.com/download/home
2) Find the related the phone module, and then download the Sccp/sip fireware, normally the phone would be worked as the S CCP,
3) The firmware since 9.0 the file extension would be changed as following show:

STEP2, copy firmware into CME router via TFTP
Run command:copy TFTP Flash:
Commits:
Please copy all of the file (all extension) into the flash.

STEP3, configure CME as Tftp-server to make the Phone download the firmware:
Run the Command:tftp-server Flash: <filename> with all the extension
For Instance:tftp-server FLASH:BOOT69XX.0-0-0-14.ZZ.SGN

STEP4, configure the 6921 load the firmware
Run the command:
Telephony-service
Load 6921 SCCP69XX.9-4-1-3SR3
Create Cnf-files

Step 5, troubleshooting
Run Commands:
Show Ephone Phone-load
Debug TFTP events
Show log

Guide to update the Cisco Phone Firmware via CME