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Hi, I installed cc mode.apk from samsung knox support page on my rooted device, now when i want to boot keep saying “custom binary blocked by cc mode”, so i tried to flash a new rom, but in the download mode there is a warning that says “download mode is blocked by cc mode”, now i dont know what to do. PLZ HELP!

What model number is your device? You will need to reflash correct matching official Samsung Firmware to remove the custom binary that has been flashed onto the device. Sounds like the device may have been rooted or had a custom kernel installed but OEM unlock was not left on enabled in developer options.

Boot into safe mode and try to uninstall cc mode apk.