Using your H 6.0 allen wrench, remove the four 20mm black bolts shown in the picture.

Take off the iron plate holding the wheel in place.

Remove the Motor/Wheel and set it aside close by to the hoverboard.

The wires from the Motor/Wheel should still be connected to the motherboard.

These bolts are very tight, it may be difficult to remove them. Try using a tool with a long handle.