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Samsung Seals Test-Server Flaw to End Early One UI Firmware Leaks

The patch locks down internal One UI builds, preserving Samsung’s controlled beta testing as the only sanctioned access route.

Overview

  • On July 25, Samsung closed a loophole in its internal FOTA test servers that had exposed pre-release One UI firmware to the public.
  • The fix prevents unauthorized downloads of under-development One UI 8.5 and 9.0 builds unless another vulnerability is discovered.
  • Leaks had been driven by a community-made C# tool that decrypted firmware metadata and accessed internal OTA test files.
  • A community user known as Farlune formally notified Samsung of the breach after identifying the unauthorized distribution of internal test builds.
  • Samsung maintains its official One UI beta program for registered users ahead of the Galaxy S26 launch to offer a controlled preview of new features.