https://www.androidauthority.com/oneplus-hydrogen-os-update-aptx-768081/
HydrogenOS update for OnePlus 3 adds aptX support for better Bluetooth audio
Apr 28, 2017 - The HydrogenOS (or H2OS) version 12 beta update has launched for the OnePlus 3, introducing support for aptX Bluetooth audio codecs.
for oneplusaptx supportupdate