How To: disable both wifi and bluetooth in raspbian

To completely disable the onboard WiFi from the firmware on the Pi3, Edit config.txt
```
nano /boot/config.txt
```
1. and add
```
dtoverlay=pi3-disable-wifi
dtoverlay=pi3-disable-bt
```
2. save
If you dont’t have WiFi cards and want to prevent wpa_supplicant from starting after boot, disable service:
```
sudo systemctl stop wpa_supplicant.service;
sudo systemctl mask wpa_supplicant.service
```