@marc
You can go ahead and update to 4.0 aslong as CIOS and HBC are already installed, just fine.
@Soul
I sent you a PM, dunno what you did wrong there mate.
DO NOT INSTALL CIOSCORP, it's a horrid program and you don't need it.........messes with the nand and stuff more than it should. Just my opinion.
If you follow the guide 100% from start to finish you will have no problems, Obey every little detail!
After this is done and you have done further steps, you will be able to play backup's (no you don't need CIOScorp forget you heard about that)