: verify /md5 flash:FILENAME (to ensure the file isn't corrupted)
Place the firmware files (e.g., SIP42xx.9-4-1-1.loads ) in the TFTP root. Set the DHCP option 66 to your TFTP server’s IP, and phones will auto-upgrade. cisco tftp server 1.1 free download
Connect to your router via console or SSH. Run the following commands: : verify /md5 flash:FILENAME (to ensure the file