Updated to 4.0.4 and now getting logging failed when trying to arm , won’t arm, using a new formatted sd 8 gb card, using mission planner , would QGC be better to update
That’s interesting. I received the same error; just not a Cube.
The same error once came on my quadcopter.
The fix was while the SD card is just below the micro USB CABLE I had by chance poped out the micro SD card so try mounting and unmounting your SD card.
May be it solves your problem like it solved mine