its not realy hacking but using Half Byte Loader on 6.20
if your firmware is 6.20 or less — then you gotta do this:
1. Copy the Patapon 2 Demo to PSP/GAME; Pack PSP/GAME full of homebrew too.
2. Copy Half Byte Loader’s “hbl” directory and “h.bin” file to the PSP root.
3. Copy UCUS98732_DATA02...