we deleted /dev/cdrom and created a new symbolic link to the new ISO name and modified manageMount.sh as below.

/opt/rsa/am/utils/bin/appliance/manageMount.sh 
cp manageMount.sh manageMount.sh_00620002 I like to name stuff with case numbers for future reference 
Edit manageMount.sh and replace the mount_cdrom function with the following and save the file.

mount_cdrom(){ 
umount_cdrom > /dev/null 2>&1 
mount -t iso9660 -r /dev/cdrom /media 
}

I found it easy to add a patches directory to /home/rsaadmin to scp the patch ISO into. 
Then create a symbolic link like this: 
ln -s /home/rsaadmin/patches/am-update-8.1.0.5.0.iso /dev/cdrom

Note the edit to the manageMount.sh for this to work does not survive patching.