Make sure the FIRMWARE IS THE SAME VERSION. If it is not, follow my other guide on updating the Goggles 3 firmware.
Turn on the Goggles
Hold the power button down until it starts beeping
Turn on the Cinelog30 v3 O4 Pro
Open the black hatch in the center of the drone (underside)
find the BIND button and use a paperclip to press and hold that.
Look back inside your goggles. it will prompt you to switch. Select SWITCH
the goggles will bind to the drone!
Next connect the drone to your PC and launch the DJI ASSISTANT 2
Update the firmware on the O4 Air unit
Reboot the drone
DOWNLOAD AND INSTALL BETAFLIGHT
And then open BETAFLIGHT, connect to the drone and test the controls. if all is well it will work.