There are four Phillips head screws (2.5mm) that need to be removed:
Two on the charging port, which is the small metallic piece at the bottom of the device.
There is one screw that is covered by a small green tape. The tape must be peeled off before the screw under can be removed.
The last screw is found on a speaker at the bottom right of the device. Once the screw is removed, the speaker must be removed as well.