What Samsung's Knox warranty flag means after flashing firmware

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Knox is Samsung's hardware-backed security platform that protects sensitive data such as payment information, biometric templates, and encryption keys. Its flag trips when unsigned or modified software is written to protected partitions, such as a custom recovery, kernel, or rooted boot image, and the change is recorded in a permanent hardware fuse. Flashing official signed Samsung firmware with Odin does not trip the flag. Once tripped, Samsung Pay and Secure Folder stop working, and Samsung may refuse warranty service for modification-related faults, though the phone still functions normally. The flag cannot be reset by any software tool, so the only reliable way to keep it clean is to avoid tripping it, which is especially important when buying a used phone.

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