It’s a tamper proof sticker. I started to peel it up, but it was just easier to press the screwdriver bit in.
as an update, these are now T8 screws
FM transceiver? Is this being utilized by something not obvious? Or is this just an artifact of an off-the shelf chip. It would be amazing if developers could write FM transmitter apps (for broadcasting to a car stereo like external devices can do). Or maybe receive FM transmissions and use a 'Radio Tuner' app.