Modern PS2 modding uses an external hard drive or USB stick.
That pre-made ISO floating around the web is almost always: Guitar Hero Indonesia Ps2 Iso
This is a custom-built game file (ISO) based on the Guitar Hero II or Guitar Hero III engine. Instead of the standard Western tracklist, modders replaced the songs with popular local music, tailored note charts, and often localized background graphics or character skins. Key Features and Popular Song Collections Modern PS2 modding uses an external hard drive or USB stick