OxygenOS Open Beta 4 now rolling out for OnePlus 6/6T.
Optimized details for Emergency Rescue
Added a feature to support reminders for privacy alerts
Improved system stability and fixed general bugs
Updated Android security patch to 2019.12
Added ringtone increasing and decreasing features for incoming calls
Fresh new chromatic effect for a more immersive and comfortable reading experience with smart color gamut and saturation adjustment (Settings-Display-Reading Mode-Turn on Reading Mode-Chromatic effect)
Download from Here.