Hello! I'm a newbie at hacking and homebrew, but I do try really hard to check out guides and such, however, I have currently been out of the scene for about a year and a half, and am needing a refresher. I currently have a PSP 1001 (I assumed I had a 1000, but the serial number on mine says 1001) with 6.60 ME-1.8 cfw. I had 1.1, but I was able to remember enough to update to 1.8. But while searching some of this forum, I was noticing that PRO is used a lot. I can't remember for the life of me what and where I had gotten ME. Can anyone tell me the difference? I assume that it's a cfw created by different coders. Am I able to switch from ME to PRO safely? I ask because I remember having to go through hoops trying to get Persona 3 Portable to work . I just received Persona 2: Innocent Sin, and attempted to play it (on 1.1) but it gave me a black screen and just shut off my PSP. I assumed it was an issue with the firmware because I remember having a bunch of issues while attempting to start up Persona 3 Portable a couple of years back, so I went ahead and looked for the latest update of my current cfw, and updated it to ME-1.8, however, I'm still getting the black screen when I attempt to load the game, and then it still shuts off. I am using the original UMD and I really wish to play through this game. Has anyone seen this problem? Can anyone help me update my firmware to whatever I can to be able to play it? Thanks so much for any help! It's very much appreciated!