Hi,
We have successfully upgrade the firmware without having any problem...
first we #save_profile
then we use
#ftp-record DEFAULT_FTP 192.168.1.22 ******(ftp server user name) des-password ******* (ftp server password)
.... (make sure we configure FTP server and set proper IP - use Ethernet Mgmt Port)
then
#upgrade "sg0810602.adi.gz" //this file is obtained from cisco.com
when we press enter, the system, reboot itself and taraaaaa....done