While we do not condone piracy, many users dump their own game cartridges using tools like VitaShell or nonpdrm . These dumps are often repackaged as VPK files for easy re-installation. If you own a physical cartridge, creating a digital VKP backup allows you to keep your cartridge safe on the shelf.
The Ultimate Guide to VPK Files for PS Vita: Installation, Management, and Troubleshooting vpk files for ps vita