source a programmer at dark-alex.org going by the name "xenogears" succesfully made a tool that allows you to boot M33 from within the 5.03 HEN environment allowing you access to the M33 VSH menu, improved homebrew support, plugins, and ISO/CSO loading. what it doesn't do: run PSX games. boot along with your PSP a small warning though: this DOES require you to flash some files to your PSP, but this is done as safe as possible. so far no serious problems where encountered, only 1 unconfirmed case where HEN would no longer boot. just make sure your PSP stays on during the flashing(only once, and takes about 5-10 seconds) you can obtain it through the source i posted, and it's a complete package so you don't need to download any additional M33 files(except optional plugins) EDIT: forgot to mention, this doesn't work on 3000's yet. most likely because M33 was designed to run on 1000/2000 PSP's, while 3000's have slightly different system files.