Extreme 9920 firmware contains primary and secondary images. When a new Extreme 9920 firmware is installed, the image in the secondary location is removed and the image in the primary location is moved to the secondary location. The new image is installed in the primary location.
system firmware update [ [ scp | sftp [://username:password@host[:port]/filepath] ] | [ htp | https [://[username:password@]host[:port]/filepath] ] ]
The reboot reason is updated to RR_UPGRADE to indicate firmware update or rollback. The reboot reason is notified through chassis-0 property.
system firmware rollback