If you are looking to customize your device in the current landscape, the process has shifted from the old Cydia days to modern "package managers" like Sileo or Zebra. How to add a repository: Open your package manager (e.g., Sileo ). Tap the tab. Tap Add or the + icon.
If you are jailbreaking an iOS device in 2024 or 2025, do not add Repo.packix.com. It is no longer maintained, may contain missing or outdated tweaks, and could cause conflicts with modern package managers. Repo.packix.com
http://repo.packix.com returns no valid Packages or Release files. If you are looking to customize your device