Use pliers to grip the gear inside of the top of the device.

You may have to remove a sticker that is covering the slit at the center of the bottom before completing the next step.

Insert a flathead screwdriver into the slit at the bottom of the device while still holding the pliers in place gripped on the gear.

Lay the device on its side. Holding the screwdriver stationary to hold the bottom side in place, use the pliers to unscrew the gear by turning the pliers CLOCKWISE.