It's quite simple actually... open the iSO in UMDGen v2.00, and look in the \PSP_GAME\USRDIR\PRX2_0_0\ directory and you will see (2) subdirectories named KMOD and MOD. Inside each of these folders are PRX files, so click on those and press the DELETE key on your keyboard to delete them from the image (the PRX files, not the directories).
Then, just drag and drop in the replacement (1.5/decrypted) PRX files in their place, and select SAVE and once the iSO image finishes saving you're done!
Okay. My first post, and I'm going to go for broke. I've made frequent use of the search function, so if I've missed the answer to this elsewhere I was simply unluky in my searching.. or dumb. >_> In any case, if I have missed the answer elsewhere, I do apologize.
I have the original, untouched iso of Naruto Narultimate Portable as well as the three folder/RunUMD fix. I have UMDGen V2.01. What I am attempting to do is rebuild the ISO properly, so that it will work with DAX Loader/RunUMD in iso format. I can open the iso in UMDGen, and I can remove the update folder. However, I can't seem to find the place to replace the prx files with the ones in the fix. They just don't seem to be there. I did look for \PSP_GAME\USRDIR\PRX2_0_0\ as was suggested earlier in this thread, but was unable to find it. Any help would be greatly appreciated. Thank you for your time.
They should be in the KMOD and MOD folders in the path mentioned above... another thing you can try is to generate a FileList.txt with UMDGen or iSOBuster, and then check to see if they are truly IN your image and where exactly, or if they are not showing at all on the FileList.txt then it may be a bad or ripped image.
I did as you mentioned and created a file list using UMDGen. I found a total of seven prx files in \PSP_GAME\USRDIR\modules\ , however they're all very basic, audiocodec, mpeg, mpegbase and the like. Also, They don't match with a SINGLE prx file included in the fix, in the X folder. Assuming that the iso that I have is indeed bad or ripped, is there a way for me to add in the proper prx's from the fix and still make a workable iso, or am I better off going hunting again?
I think maybe we're both getting confused as the guy earlier in this thread was talking about GTA vs. NNP, but after taking another look at the Naruto Nultimate Portable (JAP) NO UMD FiX you should only have to replace the PRX files found in the FiX in: narutonp\USRDIR\modules
These are: audiocodec.prx, libatrac3plus.prx, libfont.prx, mpeg.prx, mpegbase.prx, sc_sascore.prx, and videocodec.prx.
Replace those with the ones in your image (in \PSP_GAME\USRDIR\modules\) and rebuild, then use the X folder as other folders included in the FiX normal. You should be good to go then, no need to hunt down the MOD/KMOD folders for NNP!