Procedure to upgrade the S4810 firmware

** In enable mode...
** See which of A: or B: the switch currently boots from
** You'll want to load the new system in the "other" location
** The current boot location has [boot] after it
show boot system stack-unit 0

** You can specify tftp, ftp, or sftp
** Load new system into A: or B:. Best not to overwrite what you load from now.
upgrade system tftp: A:
** The switch will prompt for the tftp server address and filename

** When complete, enter configure mode:
configure
boot system stack-unit 0 primary system: A:
exit
** Now back at EXEC privilege mode
write memory
reload

** After the reload
show version
** Check to be sure the next boot gets the correct system
** You should see [boot] after the system you want
show boot system stack-unit 0