I've inherited an ASA5550 which is missing its SSM-4GE-INC - it was taken out to upgrade a 5540, which is now in production elsewhere in the enterprise. Trouble is, now the 5550 will not boot, it gets stuck after a panic message, and reboots:
Panic: Init Thread - Module SSM-4GE-INC is not present. Rebooting...
I'm taking this as the unit cannot function without this module installed, so I'm looking for confirmation of this, or alternatively a way around the message I'm getting.
Unfortunately ASA5550 comes with fixed SSM-4GE card and it can't be removed, hence you are getting that error message.
You would probably need to source that 4GE card back and installed it for it to boot again.