I just recently got a psp go installed with cfw 6.35 pro B. I want to update the cfw because some homebrews are not compatible with my current cfw, however I'm informed that installing wrong cfw could brick your psp so I would like to ask:

1. are the released cfw compatible with psp go? or I have to find specific cfw?
2. how to determine the model of my psp go and to check whether it's compatible with the cfw? I read the psp go have different model like b5, b6, b7, what are those? and how to see it in my psp?