MacOS often flags Sliver as "malicious" because it is unsigned.

Run this script in your Mac Terminal. It installs the necessary libraries (like Python 2.7 and specialized USB backends) required for Sliver to communicate with pwned DFU devices. 2. Fixing "App is Damaged" or "Move to Trash" (Quarantine)

to add support for newer firmware like iOS 12.5.5 and additional M1 Mac fixes. It is generally recommended to use the latest version available on the AppleTech752 Official Site unless you have a specific reason to stay on 6.1. Are you working with a specific iPhone model iOS version that is giving you trouble?