Clone this repo locally.

gh repo clone ChronoByte404/T2-Ubuntu-WiFi-Bluetooth

Cd into the folder.

cd T2-Ubuntu-WiFi-Bluetooth

Chmod the bash script.

sudo chmod +x ./install_wifi_bluetooth_firmware.sh

Run the script as sudo.

sudo ./install_wifi_bluetooth_firmware.sh

Re-load the Mac firmware.

sudo modprobe -r brcmfmac && sudo modprobe brcmfmac