What is the correct procedure for connecting Machenike G5pro V2 via Bluetooth to a Windows PC?

Turn off the gamepad and switch it to 'PC/iOS' position, hold the Menu button for about 3 seconds until LED 2 flashes quickly. On your PC, open Settings -> Bluetooth & other devices -> Add bluetooth or other device and select 'Xbox Wireless Controller' when found in search mode (Page 5).