Using Qgis to convert geotiff files for usage in mission planner

Hello, I have tried to convert geotiff files to WGS84, but Mission planner refuses to load these.

I am allmost going crazy, because Qgis does not want to spit out the correct format. Raw files:

Conversion attempt:

Related feature request:

So, what is the correct procedure to get Qgis to spit out the correct format that is compatible with mission planner?
Screenshots will be helpful!

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