If your device was rooted or uses a custom ROM, reverting to the stock ROM and recovery can help.
To settle this definitively, we consulted:
Unanimous Conclusion: Once the Knox Warranty Bit is 0x1, it cannot be returned to 0x0 by any software, hardware tool, or service available to the public. reset knox warranty void 0x1 back to 0x0
Samsung’s own internal engineers cannot reset it without physically replacing the eFuse component (which is integrated into the SoC or security chip). Even Samsung’s official service centers do not offer Knox reset—they offer motherboard replacement.
Searching for “reset knox warranty void 0x1 back to 0x0” will lead you to: If your device was rooted or uses a
If you are a hardware engineer with a cleanroom and $10,000 in microsoldering equipment, there are theoretical methods:
It never changes.
You could technically replace the entire main processor (which contains the Knox e-fuse) with a new one from a donor phone that is still 0x0. However, on modern Samsung phones, the processor is paired with the UFS storage and other security chips. After replacement, the phone will likely fail attestation or refuse to boot due to mismatched device-unique keys.