The Samsung Knox warranty bit is a security feature that detects when unofficial software has been installed on your phone. This helps prevent malicious attempts from accessing your data.
The Knox Warranty Bit detects if a non-Knox kernel has been loaded on the device. It is a one-time programmable bit e-fuse, which can only be turned from 0X0 to 0X1 (i.e. burned). If a non-Knox boot loader or kernel has been installed on the device, Knox can no longer guarantee the security of the Knox container. As a result, the Warranty Bit will be burned to 0X1, indicating that this device can no longer use the Knox container service.
If the Knox bit has been burned:
- A new Knox container can no longer be created on such a device
- The data encrypted and stored in an existing Knox container can no longer be retrieved
Everything else outside the container should be the same as before.
To know whether the Warranty Bit has been activated, please follow the next steps:
- Power off your device.
- Once off, simultaneously press the volume down, home, and power button.
- When warning screen is displayed, press the volume up button.
- The Warranty Bit status is displayed in upper left hand corner.
If the Warranty Bit is fired, the device displays Knox WARRANTY VOID: 0x01.
If that is the case, there is no way to revert the Warranty Bit and Knox won't work on this device. The only way to get the device back to its original settings is to replace the PBA (Printed Board Assembly) on the device; hardware replacement will be required.