Knox Off firmware is a modified system firmware designed to bypass the KG lock on Samsung devices. It allows users to flash the device without risking a re-lock, unless the device is flashed with official firmware. After installing Knox Off firmware, the firmware status on the device will change to "Custom." Note that your device must have an unlocked bootloader and a completed KG status (either "Completed 11" ,Broken 00 or "Completed 00") to successfully flash this firmware using Odin mode.