, a classic custom firmware developed by Dark_Alex that allowed users to run homebrew and backed-up games. Format Distribution 184 ISO/CSO Files

The PSP Mega-Pack is a comprehensive collection of PSP games, homebrew applications, and utilities, all packaged into a single, convenient bundle. This mega-pack is designed to cater to the needs of PSP enthusiasts, providing a vast library of games, demos, and tools to enhance your gaming experience.

Back in 2008-2010, a 4GB or 8GB Memory Stick Pro Duo was considered "large." A standard ISO could take up 1.5GB of that space. If you wanted a diverse library, you had to compress.

The -l suffix likely indicates “light” or “slim” compatibility, possibly for PSP-2000/3000 series.