I know how to hack guys, I've downgraded and installed 3.71 m33-4 on 6+ PSP's (all my brothers and friends), both slims and fats, and even written my own hacking guide, I just haven't done anythign in a while so I'll need to have my memory refreshed.

My brothers PSP (the one I will be using) is 3.71 m33 or 3.9x (I can't remember what the x is) m33, so I'll just have to upgrade to 5 m33 (for the themes).

When I find out for sure what firmware it is, I'll reply back to this thread.

IF its 3.71 m33, can I just upgrade to 5.0 m33 from 3.71, or do I have to upgrade to 3.9, 4.0, etc. before I can upgrade to 5.0?