KG Lock (sometimes called “KG State” or “KG Lock”) is a Samsung security feature found on certain models (especially with One UI 5.1 and later). It’s triggered if the device detects unauthorized firmware modifications, failed authentication attempts, or when Samsung’s “Reactivation Lock” or “KG Secure Check” is activated. Once KG Lock is active, the device may refuse to boot or flash custom binaries.
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service call knoxguard_service 37 (often used to query or change state). What is “KG Lock” on Samsung devices