RPi3 Disable Bluetooth Or WiFi By Default

Step

1. Use sudo mount /dev/mmcblk0p1 /mnt to mount SD Card

2. Use sudo vim /mnt/config.txt to edit config

3. Disable WiFi Add the following script to disable WiFi

    dtoverlay=pi3-disable-wifi
   

   

4. Disable Bluetooth Add the following script to disable Bluetooth

    dtoverlay=pi3-disable-bt
   

   

5. And then use the following script to shutdown the services of bluetooth

    sudo systemctl disable hciuart.service
   

   Then

    sudo systemctl disable bluetooth.service
   

   

6. Reboot

    sudo reboot
   

   

7. Now you can use iwconfig to check if the WiFi is disabled

8. Also can use hciconfig to check if the Bluetooth is disabled

Note

I don't know why if I use sudo systemctl disable bluealsa.service to disable bluealsa,
the raspberry pi will show this :
Failed to disable unit: No such file or directory
Maybe Raspbian-Stretch has remove this service by default ?