Simply take the Ulaunch.iso from this forum. Then make a bootable cd and from there you will manage to do BOOT folder and transfer BOOT.ELF to memory card ... you'll see how easy it is. And if you have CodeBreaker the elf ... you will be able to run it with uLaunchELF.
PlayStation 2 SCPH 50004 (V9) Matrix Infinity FW 1.93, MAXTOR 120GB, RGB, Eye Toy, SingStar KIT, 3D Glasses by SplitFish, USB Stick 256mb by Emtec
Soft: HDL 0.8c, uLaunchELF v4.12, myPS2 v1.2, SMS 2.0, MediaPlayerPRO