btusb.zip was built by NormanPai, see https://forums.developer.nvidia.com/t/installing-intel-ax200ngw-bluetooth/115362/7 and Download btusb.zip
This file aims to make bluetooth available on Jetson Nano with AX200.
Fitst, back up the file /lib/modules/4.9.140-tegra/kernel/drivers/bluetooth/btusb.ko
sudo cp -r /lib/modules/4.9.140-tegra/kernel/drivers/bluetooth/btusb.ko /lib/modules/4.9.140-tegra/kernel/drivers/bluetooth/btusb.ko.bak
Then replace this file in /lib/modules/4.9.140-tegra/kernel/drivers/bluetooth/btusb.ko.
sudo cp -r btusb.ko /lib/modules/4.9.140-tegra/kernel/drivers/bluetooth/btusb.ko
Finally,run install_ax200_driver.sh, see https://www.semfionetworks.com/blog/80211ax-remote-packet-captures-using-the-jetson-nano
bash install_ax200_driver.sh