A: Check vitadb.rinnegatamante.it or the developer's GitHub directly. Avoid "ROM sites" that mix homebrew with fake Vita game links.
Unlike older cartridge-based systems that use standard .bin or .rom extensions, the PS Vita relies on specific file structures designed for its proprietary operating system. ps vita roms vpk
Some sites bundle fake VPKs with executable files ( .exe ) that infect your PC. Others provide corrupted VPKs that can crash your Vita or, in rare cases, trigger a soft-brick. A: Check vitadb
RetroArch 1.3.6+ beta release for PS Vita HENkaku! - Libretro in rare cases
Are you using an or an official Sony memory card?
There is often confusion between VPK files and NoNpDrm backups.