The OnePlus 6T abandoned the headphone jack, but that caused an issue - the Audio Tuner option (i.e. the equalizer) in Oxygen OS only worked with wired headphones, Bluetooth ones were not supported. So, unless you had a pair of USB-C headphones, you essentially had no equalizer on your new phone. This injustice is being addressed with version 9.0.7 of Oxygen OS, which will improve the overall stability of the Bluetooth connection too. Wi-Fi stability is getting improved as well and atandby power consumption has been decreased. Camera performance when shooting slow-motion videos should...
Source: https://www.gsmarena.com/latest_oneplus_6t_update_brings_an_equalizer_for_bluetooth_headphones-news-34523.php
