What official firmware does the game Marvel Ultimate Alliance 2 need to play on PSP?

I currently have CFW 5.00 m33-6 on a phat 1000 psp and wanted to run the ISO but it does not load. Is there a CFW to be able to play this ISO?What official firmware does the game Marvel Ultimate Alliance 2 need to play on PSP?
5.50 gen-b2



CODE

5.50GEN-A: http://www.megaupload.com/?d=GH6T6BDC



5.50GEN-B: http://www.megaupload.com/?d=C74BQB76



5.50GEN-B2: http://www.megaupload.com/?d=DDGQRUOY



Marvel Ultimate Alliance 2





INFO

PATCHED: YES

FORMAT: ISO

REGION: USA

RIP:NONE

WORKING ON: FIRMWARE 5.50GEN-B2



DOWNLOAD:

CODE

LINK 1: http://www.megaupload.com/?d=9IYQR6V7

LINK 2: http://www.megaupload.com/?d=5F2CVIYL



its already patch so all you do is extract the iso then put it in your iso folder and play





First update to GEN-A, then GEN-B, and last GEN-B2.What official firmware does the game Marvel Ultimate Alliance 2 need to play on PSP?
you must have atleat 5.55 but since there is no cfw 5.55 you WILL need to upload up to cfw 5.50Gen-B and download the ISO patcher wich enables you to play this.

Games Decrypter v2 (google it)