, you must use a specific version of the DJI Assistant 2 software. While newer drones often use the "Consumer Drone Series" version, the original Mavic Pro is supported by the or the older general DJI Assistant 2 builds. DJI Assistant 2 for Mavic Pro: Official Download Links

Practice flying in a virtual environment using your actual Mavic Pro remote controller while the drone is tethered via USB. How to Connect and Use

Ensure your drone battery is charged above 50% and your internet connection is stable.

Ensure you are using a "data" cable, not just a charging cable. Try a different USB port on your computer.