I have a Zigbee USB adapter and I need to use the raspberrypi thats running HA (via the SD card install as per instructions) to flash the zigbee adapter. How can I get terminal so I can Install “WiringPi” and do a git checkout etc.?
https://www.zigbee2mqtt.io/information/alternative_flashing_methods.html
Not sure if that’s doable… but if you have a spare SD card, the easiest way would be to flash the spare one with Raspbian, insert it to the Pi, do the job there, and afterwards just change the cards again. That’s what I do and I needed the spare one more than once since I started using HA 
Great idea, thanks.