Hereīs the BOR.elf (all the .PAK mods for Beats of Rage Ps2 here: dl.openhandhelds.org/cgi-bin/gp32.cgi?0,0,0,0,11). just put it inside a folder with the .pak file named BOR.PAK. thereīs no menu to select different paks so if you want to play different bor.paks, you have to make multiple folders with the bor.elf and a bor.pak inside each one. then use uLaunch.elf to load the elf.
I didnīt really port ulaunch.elf. I donīt have the skills to port anything, lol I just switched the usb drivers with working ones for the ps3 and compiled the elf. As simple as that.