How you use the file depends on your target device. Below are the three most common use cases.
Place the downloaded "PSXonPSP660.bin" and update files into the correct directories on your PSP's memory stick. Directories often used are ms0:/PSP/GAME/ for game-related data and specific directories for updates. download psxonpsp660bin upd
The inclusion of "upd" in the search query suggests a misunderstanding or a specific technical requirement: How you use the file depends on your target device
: It provides improved stability and fixes for certain games that might otherwise struggle on older BIOS versions. Installation and Setup download psxonpsp660bin upd