The PS2 BIOS is essential for the emulator to function. Emulators cannot legally include BIOS files with their downloads, so you must provide your own. The BIOS should be obtained from a PS2 console you own.
The quest for "highly compressed" PS2 games for Android is a response to the massive storage requirements of the original PlayStation 2 library. While a standard PS2 game typically ranges from (with some dual-layer discs reaching 8.5 GB ), modern compression techniques can reduce these files significantly, often by 30% to 50% without losing data. 1. The Necessity of Compression ps2 highly compressed games for android