The FUS server is not a simple file host; it is an intelligent dispatch system. When a Galaxy device connects to FUS, it doesn't just ask, "Is there an update?" It negotiates.
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: An older utility used for the same purpose, though many versions are now deprecated or superseded by Frija . samsung fus server
Additionally, Samsung is experimenting with where the server predicts which files you need before you request them, pre-caching updates to reduce wait times. The FUS server is not a simple file