What PSP version do i need to run Monster Hunter Portable 3 (my psp CFW is 5.50 Gen-d4?

According to IGN, MHP3 hasn't been released yet.. so that might be the problem.. its disabled until the release date. It is listed as 'Japan Only' on other websites(released Dec 1st, 2010). If you aren't on a Japanese version PSP, that might be the problem. USA release isn't until July 2011(rumor, not official date)