The most reliable way to get a zRIF key is to generate it from a game you legally own on a hacked PS Vita.
Many users turn to NoPayStation (NPS), a massive community-driven database that hosts links to Sony's official PKG files alongside their corresponding zRIF keys. zrif key vita3k free
Navigate to ux0:nonpdrm/license/app/[TITLE_ID]/ using VitaShell. Step 3: Find the .rif license file. The most reliable way to get a zRIF