The purpose of this post is educational, focusing on how the technology works and how to manage your own backups and homebrew. We do not condone piracy.
For large games (e.g., Killzone: Mercenary), use the “folder install” method to avoid double storage usage: extract the VPK contents to ux0:app/TITLEID/ and refresh LiveArea in VitaShell. ps vita roms vpk upd