im not talking about CFW, there are enough tutorials on that. assuming you allready have a hacked PSP; you will also need at least a 1TB empty usb drive, and a 16gb pro duo card. (might need 7-Zip, for files that are game.001, game.002. game.003) 1. when searching for a PSP ISO, make sure to get official SCENE RELEASES! a good rom/iso will have: release number, name, then, Release group and region for example """1234 - Wad of Gore EUR PSP PLAYASiA""" see advanscene.com/ for more information find a website that searches within file hosting sites, filegaga, filetram, filestube, etc. or if you use a Rom site, a good one will probably be in Europe in another language. first you will need to know the release number and release group from advanscene.com/ search Name And Group, for example; "Wad Gore Playasia", or "wad gore 1234", that way you know its an official scene release. the Europe and USA version usually have different Release Groups, but check both regions release group to make sure. EU and US Save files are Not Interchangeable, Sometimes USA roms are smaller, sometimes EUR roms have more content. Europe has more Language files, but there are Extra Levels for Europe only. (Lemmings) sometimes games are censored, in Germany you must show Green blood in games. 2. Verify your rom collection. Get Offlinelist and Dats from Advanscene. unfortunately, Offlinelist only works with Zip files at the moment. so you will need to make 4 copies of each game, Zip, ISO, ISO modified, and Cso. extract the RAR, Delete the Rar files, ZIP the ISO, run OfflineList.EXE, Load PSP or PSN Dats, go to tools/options/renamer, Uncheck "move unknown files", set Roms folder. uncheck show missing in view, Put Zip file in Roms folder. refresh rom list. if the game shows up in list your golden, if not you have a Bad ISO delete and redownload it somewhere else. 3. Shrink the Game. its a good idea to modify the ISO first to make it smaller. Hot Wheels ultimate can be shrunken down to 88MB from a whopping 826MB!! and Medal of Honor goes from 1.1GB down to only 368MB -Get UMDGen v4.00. Load UMDGen. open ISO file. under "UMD Properties" Click Optimize button. however in some rare cases Optimize button deletes important files. "Mana Khemia student alliance" cannot be optimized, and "Cube" breaks if you touch it, because it searches for update files. you should always optimize no matter how small it is. you just might need 30mb for a PSN Mini. -Under Explorer Tab, click PSP_Game folder. right click SND0.AT3 and select DUMMY. this will remove the annoying loud Music at the XMB game selection menu. -you can also remove/relink movies and sounds but Dont Even Bother, it dosent really make much of a difference either way, at most you will save maybe 35mb. and it Ruins the game experience. -even though its only like 2mb you should relink Foreign Language files anyways. there might be files with EN, JP, SPA, ITL, GER, FR. in the name. just select the EN glish file as source, then relink all corresponding languages to the similar EN file. -Finally, create an ISO first And then a CSO. Use the Lowest compression value, 1. the difference between 1 and 9 is almost nothing. the higher compression is not worth the Lag and Slowdown and Wait time. -if the CSO is only 100MB smaller, USE THE ISO. its not worth the Lag and Wait Time. note; PSN Minis, do not need to be Compressed, as there so small it dosent matter, but removing the excess padding from a PSN Mini saves 100MB every time. 4. delete the files you dont need. keep the origional file and 1 modified file on your computer. i keep 3 files for each game, a zip file plus a untouched ISO plus a Optimized file. if compressing it to CSO dosent really do much, then use the Optimized ISO, and delete the cso. CSO sometimes breakes the game because of LAG. but other times there is absolutly no Lag as is the case of Hot Wheels.cso which is actually too fast anyway. so to sum up; -get only a untouched verified scene release ISO, ""0001-Gamename_PSP_(USA)_Group.rar"" -always remove excess padding with UMDGen -remove annoying XMB menu Music via SND0.AT3 -dont bother deleting any files it dosent change the size much. -only use CSO if it saves a considerable amount -and use Lowest compression value, 1. no difference between 9 and 1. -CSO may cause Lag and Wait Time -keep an untouched ISO somewhere for later. -dont patch a game because your CFW is old, just get newest firmware. -decide US or EU before you play, save files cannot be converted between regions.