If the project is open-source, ensure you are cloning the source and compiling it yourself, or downloading a pre-compiled binary from the verified project page. How to Verify the Downloaded pkgunsptlistbin File

The KEYS file is usually provided on the same download page.

If pkgunsptlistbin appears in a custom embedded Linux build:

Download the official firmware update file directly from the manufacturer’s verified website.

Ensure the file was downloaded via https from a legitimate domain. How to Install pkgunsptlistbin