In some cases it is easier to use ISO image file instead of an actual CD to upgrade SPLAT device. There are several reasons for that: no physical access to your server, upgrading SMART-1 or any other appliance where CDROM is not installed, etc.
Remember, you only need a CD for major upgrade, such as going from R65 to R70.
Let's see how it is done.
First, check if you have enough space on the hard drive. Use df -h command to see where you have enough space. Mind some extra for upgrade operations.
Then create a folder to put ISO file. The best place is /var partition. Run the mkdir /var/temp/"your ISO folder". Transfer your CD image there.
Now it is time to mount it. Run mount -t iso9660 -o loop /var/temp/"your ISO folder"/"your ISO file".iso /mnt/cdrom.
Check it is mounted OK with ls /mnt/cdrom.
Now you can run patch add cd and do the upgrade. Good luck.
Just one last note. You may not want to use snapshot during the upgrade procedure. If you absolutely need to make a snapshot, do it before transferring ISO and mounting it. Do not forget to save it on an external server.