If you prefer not to use a browser tool, you can manually find the ZRIF.
The ZRIF string is simply a part of the metadata in the database files (like tsv files) found on the NoPayStation website. You can download the .pkg file manually and then search the database for the corresponding ZRIF code. For users who want a complete library, batch installers exist that use these TSV files to automatically match ZRIF codes to PKG files. zrif key vita3k free
When you install a game (usually a .pkg file) into Vita3K: If you prefer not to use a browser
Assuming you have obtained a zRIF key (either through NPS Browser or your own Vita), here is how to use it in Vita3K: zrif key vita3k free