or
Before typing a single command, it is critical to understand what the AR9271 is. Unlike many other wireless chips that rely on the host CPU for MAC layer processing (SoftMAC), the AR9271 is a device. It has an onboard microcontroller that handles MAC functions, making it incredibly reliable for frame injection.
Check: sudo rfkill list
sudo modprobe -r ath9k_htc sudo modprobe ath9k_htc
sudo airmon-ng check kill