InsaneNutter
Resident Nutter
Yup basically, I upgraded to from an older CFW to the latest by doing as described.

I have downloaded an assortment of zipped iso games/files which I am extracting with 7zip and placing in an ISO folder within the GAME folder on my memory stick.
The problem for me is that I'm not sure if this is the correct place to put them as there is conflicting information (at least to my noob brain) within this thread.
ISO's go on the Memory Stick in a folder called "ISO", you should then be able to load them from the Games / Memory Stick section.
You can only put ISO or CSO (Compressed ISO's) in this folder, nothing else.
Homebrew apps / emulators go in the PSP > Game folder inside a folder with the homebrew applications name. So for example PSP > Game > GBA (files for the emulator would be in the GBA folder)
I'll try get some screenshots added of where things should go after modding, however as i've described above is correct.
Is there any way to compress an ISO to a CSO for extra space?
Yes, see my tutorial on How to rip and compress your PSP UMD games. As you have the ISO already simply skip to the part on compressing the game with UMD Gen.
Most games you can compress with a compression value of 9, the only games I ever remember having problems with compressing are the GTA games.
Yup just download the version that is correct for your PSP version, no need to remove anything first.
Glad all is working, enjoy your PSP in 2019 and beyond!
Had a quick question for you. I've got a psp3001 (model 04G) I've had for over 10 years that is running 6.20 pro-c2 permanent. I hacked it when I was in Afghanistan in 2010-2011. My question is should I upgrade to 6.60 pro cfw is there any benefit over 6.20 pro c2? Thanks for your continued contributions to the psp modding community!