Remove the back plate and the battery with the receiver

Use your Phillips 00 screwdriver to unscrew the 2 screws as shown in the image. Be careful when removing the bottom part of the mouse because there is a cable you have to disconnect.

Using your Phillips 000 screwdriver or bit, unscrew the 2 screws holding down the scroll wheel.

Now, using the same bit, unscrew the 2 screws holding the board down.

Now, on the top side of the mouse, you're going unscrew the screw at the back

Next, you're going to use your Phillips 00 screwdriver or bit and unscrew the screw on the tiny board.

Now using a spudger or your hand, your going to pull and pry at the back of the mouse to remove the upper layer

Finally you can remove the tiny board. First remove the cable, then pull up on the cable to remove the board

Hooray! You're done. Now put it back together.