We have a course here that could potentially help you out:
But my guess is that you’re trying to load DroneBlocks after connecting to Tello. Since DroneBlocks requires a good network connection to download the blocks you may be experiencing a white screen. What you should do is the following:
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Close DroneBlocks
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Make sure you’re connected to a good network
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Open DroneBlocks and wait for the blocks to load
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Now you can connect to Tello and begin coding your drone
Let me know if that helps or not. Happy to help you get it sorted out.