"Entering DNX mode, waiting for a fastboot command" is a message that usually indicates an issue with Intel-based Android devices, wherein the devic,e after failing to boot automatical,ly enters Download & Execute (DNX) mode. Most commonly, it results from corrupted firmware, unsuccessful updates, or system bootloader problems. A quick fix could be force restarting the device first. But if this doesn't solve the problem, then you have to connect it to the PC and flash the appropriate stock firmware either using fastboot or manufacturer flashing tools. Reinstalling the firmware is one sure way to get rid of this problem. Occasionally, echanging the he USB cable, switching the port, or reinstalling the drivers might be the way out.