If you are on MacOS and are using HASSIO and can’t easily mount the boot partition I recommend using the SSH approach.
(I needed to do this in order to get my RaspBee 2 to work)
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Follow these steps to get an ssh acces to the host
https://developers.home-assistant.io/docs/operating-system/debugging/ -
SSH onto the host (port 22222)
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Execute the following command to append the line into the config.txt
echo $'\n# Disable Bluetooth\ndtoverlay=disable-bt\n' >> /mnt/boot/config.txt -
Verfiy that the line has been written
cat /mnt/boot/config.txt -
Reboot the host
reboot
Hope this helps somebody 