So you have got some new games but can't play them on your CFW and you're wondering "Why doesn't it work?" well this is the right tutorial for you to fix this issue
These games will be most probably 5.55/6.00/6.10/6.20 Games so they'll need patching via an application called ISO Tool
If you're patching 5.55/6.00/6.10 games, follow steps till 8 only ( and at step 3, you'll only need PSP 1000&2000 folder or PSP 3000 folder according to your folder, MGSPW&KHBBS folders are for MGSPW and KHBBS games which are 6.20 Games )
If you're patchig 6.20 games, follow all steps and make sure you're using an ISO not a CSO and make sure it's an original unmodified ISO.
Follow these noob friendly steps
1-Download ISO Tool 1.51 v2
2-Extract it
3-If patching from a PSP 1000 or 2000, copy the ISO from PSP 1000&2000 from to ISO folder on your PSP
If patching from a PSP 3000, copy the ISO from PSP 3000 to ISO folder on your PSP
If patching MGSPW game on either model, copy the ISO from MGSPW folder to ISO folder on your PSP
If patching KHBBS game on either model, copy the ISO from KHBBS to ISO folder on your PSP
4-Open the application from Game - Memory Stick on your PSP
5-Navigate to your ISO and press X ( note to enter a folder if you have game categories, click d-pad right, and to get out of that folder, click d-pad left )
6-Choose Eboot Decrypt.
7-It'll ask you if you wanna make a backup, click no
8-On the next two questions, pick yes
9-When it's done, click X on your ISO again and choose patch this time
10-Choose prometheus method
Those are the steps for 5.50 users
Extra steps needed for 5.00 M33 :
11-Navigate to your ISO, press X
12-Choose PRX import
13-Pick libfont.prx import
14-You're done!
There are extra steps needed for KHBBS which I'll add later, once I grab the game