Firmware files downloaded from unverified third-party sites (often disguised as .img files) can contain malware or backdoors embedded in the Android system partition. For Linux distributions, this risk is lower if downloaded from official Armbian sources.

If the flashing tool doesn't change color when you plug in the USB cable, try a different USB port on your PC (preferably a USB 2.0 port instead of USB 3.0). Ensure you are using the correct USB port on the TV box itself.