Does anyone recognize this chip from GoPro Hero3Plus Black Edition?

I got two Hero3+ Black Edition prototype in hand, one is working, the other's wifi doesn't work. After comparing their mother boards, I found one missing a chip, the chip is located here:

I enlarged that chip:

The chip is about 5.5x1.5mm. Does anyone know what the P/N or model of this chip?

Thanks,

Dennis