4.40 CFW --> Restore PS3 System --> 4.40 CFW

Hello everybody,

I was thinking about if it's possible to get back to the Factory Setup from 4.40 CFW's without any problem of bricking/blocking/banning? And then, if it's possible, to get again on the 4.40 CFW. I want to do that because there's too many things that wasn't running well (mM won't get updates,...)

Thanks for answering me :)