The Fires are actually Android tablets so use MTP on USB. Amazon stopped calling them Kindles because it's confusing and misleading. So connecting a Fire to Calibre is like connecting an Android phone or tablet.
The DXG is really limited firmware and features compared to the Kindle Keyboard 3. No Publisher fonts, no KF8. It didn't get the later FW, because it's really a DX with updated screen. Not enough RAM.
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