249, 222 and 250 are just the cioses used by the loader to start itself up.
249 needs a 249 cIOS (like cIOS d2xv6 249 Base 56)
222 needs a 222 cIOS installed (like Hermes cIOS 222 v5 Base 38)
250 needs a 250 cIOS installed (like cIOS d2xv6 250 Base 57)
In the past cIOS 222 worked better with...