Can't downgrade fw from 1.04.00.10

Correct. You can’t Downgrade. DJI limitation, I’m afraid. See this thread
There are a couple of options. If you want to use DD for mission planning and image processing you’ll need one of the ADKs for 1.04.00.10…or you can wait until all the issues with the ADKs are ironed out. Alternatively, if you only want to try Map Engine for now then you can fly the mission through another means and upload the imagery to Map Engine.

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