I am not sure, I have never worked with an IPC, but I don't think you have to configure anything on the prom.  I found something that said, "Power off, power on, hold [L1]+[N], (or [STOP]+[N]) until the PROM prompt. This will reset your PROM to the factory defaults."  Which is all you should need. 

Why did you replace the PROM in the first place.  I have never heard of one going bad, but it is possible.  The only other reason I have heard is because it had a password on it.  You can get around the password......... but it is not something you want to do unless you need to.

Dusty