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I would try re-flashing the firmware.  I've had that recover an FC.  Just the 1st 3 beeps without the  last 2 usually means the ESC is working but the FC isn't seeing it. 


Conformal coating I would think has to reduce the heat dissipation somewhat at least.  The little AIO boards could be sensitive to that I suppose.   How is an indoor tiny whoop likely to get wet anyway?  I don't fly my TinyHawk outdoors.