I have a new Cisco C4507R-E and am running two WS-X4515 Supervisor IV cards. when I connect to the console and boot, I receive the error "Unsupported Chassis Type 65535, system can not boot." I believe it is IOS version 12.2(22). I then entered ROMMON mode and set up a TFTP server on my PC. I set up to boot from TFTP to IOS version 12.2(37)SG1, which came on CD with the rest of the equipment. The OS loads from TFTP but gives me a similar error "Unsupported Chassis Type 5...." I've tried booting connected to both Supervisor cards and I also tried removing one of the cards to avoid potential conflicts. I don't really know where to go from here.
I had the exact same problem recently. The Sup IV was shipped brand new along with a 4506-E chassis from the distributor with an older version of IOS that did not recognize the new chassis. I, nor my customer, were real happy about this situation. I had to open a Cisco TAC case. They had me load a new IOS. The TAC engineer had me follow this document:
It had to be version 12.2(44)SG or newer.
Good luck! Or, since this is uncharted territory maybe I should say:
May the force be you.