PATCHEDCB9.3.ELF (attached CB_launch.elf) (Codebreaker ELF version)
OpenUsbLd_USBA or OpenUsbLd
Copy PATCHEDCB9.3.ELF to mc0:/BOOT/ or USB storage
Rename OpenUsbLd_USBA or OpenUsbLd as CB_launch.elf and copy to mc0:/BOOT/
Then run PATCHEDCB9.3.ELF and use or add your codebreaker code as normal and START game.
Once the OpenUsbLd_USBA or OpenUsbLd screen appears, you can play your game of codebreaker with USB HDD .
I used a mp3 card to load a game "Pacman Fever". Run PATCHEDCB9.3.ELF, choose code then START. It goes back to UlaunchELF and I run CB_launch and it goes to OpenUsbLd_USBA screen. I choose the game and play it. It works, I get maximum token 999.
Remark : If you use slim PS2, you need to plug out the usb device after you run the PATCHEDCB9.3.ELF and plug in again when the OpenUsbLd_USBA or OpenUsbLd screen appears, otherwise it will be blackscreen.
Thanks to those who paied efforts on PATCHEDCB9.3.ELF, OpenUsbLd_USBA ,OpenUsbLd.
Amend the method :
Use CB_launch.ELF to rename as BOOT.ELF and put under the BOOT folder.
It goes to OpenUsbLd screen directly afer entering codes and START GAME.