Advanced jailbreakers sometimes create an offline of the official repo's .deb file to install via Filza when their internet is down. This is a legitimate use case—extracting the .deb from the repo and repackaging it for local storage.
It is used to install apps from third-party app stores (like AppCake, AppAddict), tweak apps, or for developers testing their own applications. Compatibility: It supports iOS 5 up to iOS 14 and beyond. appsync unified repo repack