I would be surprised if they didn't. They advertise their own Bluetooth chips H1...

		Cu3PO42 on March 31, 2021 \| parent \| context \| favorite \| on: Android's new Bluetooth stack rewrite (Gabeldorsh)... I would be surprised if they didn't. They advertise their own Bluetooth chips H1 and W1 in AirPods and some Beats products. These chips definitely have their own firmware and it would be rather ridiculous not to also have their own firmware on the host side, maybe even re-using code.

Most of them run RTKit, I believe.