Damn this kid works fast doesn’t he? Today PSP dev Yoshihiro released v4 of Game Decrypter, a homebrew application that allows users running custom firmwares to play games requiring OFW 5.55 and higher. This update in particular fixed a bug with the YS Seven game, and set up the groundwork for compatibility with new OFW’s coming out (For example, 6.10).
A list of compatible games is being handled over at GBAtemp.
Download: Yoshihiro’s Game Decrypter v4
From the README:
hi guyz this tool is here for let you use your original game backup
on CFW 5.50 gen B-2 and 5.03GEn.
What's new ?
Fix: Probem with YS seven game. He work perfect on PSP3000
Added:compatibility with the futur Game 6.xx
how i can use this tool ?
1 :lets go first you need to install the GameZDecryptZ folder in your X:PSP/GAME folder
2 : Open you iso with UMDGEN 4
3 : Go to File>File List>Export
4 : Save it as Filelist.txt
5 : Extract the EBOOT.BIN with UMDGEN4 in PSP_GAME/SYSDIR
6 : put your EBOOT.BIN extracted from UMDGEN PSP_GAME/SYSDIR and put it on root of your memory stick
7 : now you can boot game decrypter now you can press X 5 seconds later it's done 
8 : connect your usb cable check on root of your memory stick you have a new folder called decryptor
9 : copy the eboot.bin from the decryptor folder inside umdgen
10 : Go to File>File List>Import
11 : Choose Filelist.txt
12 : Select YES to forcing LBAs, then Save
13 : REbuild your ISO.
Enjoy it Yoshihiro
yoshihiro can you talk with jpcsp team ? jpcsp.org….your program decrypter is needed….can your program to decrypt a game in a pc ??we need decrypt the game directly in a pc …please
Link | November 2nd, 2009 at 12:06 pm