CarGoSki, I had that happen with an upgrade from R7 to R9.1.400 changing an IP500V1 to an IP500V2. I installed the config on the new IP500V2, downgraded it to R8.1 so when I connected it it would upgrade the Digital modules to R8.1 first. Everything worked great. Then I upgraded the system from R8.1 to R9.1 and it changed the PRI to an ISDN module and I couldn't do anything about it. I was able to erase the configuration via Manager and it changed the module back to a PRI module. I then loaded the IP500V1 configuration again and it took it properly.