OnePlus does a remarkable job with its old smartphones. Unlike some companies that quickly focus on newer mobile phones, the Chinese company always offers solid software support for its old smartphones. Android 10 is now running on every OnePlus released after the OnePlus 5. However, this does not mean that OxygenOS is at rest. The latest OxygenOS update for OnePlus 6, OnePlus 6T, 7 and 7T offers several new functions. Among the new add-ons we have the security patch for May 2020 and a newly added section for epic games in the game space for Indian variants. If you're not aware, Epic Games is behind Fortnite, one of the most successful, if not the most successful, Battle Royale games on the market. The Battle Royale is not Epic's only offering, however. The company has its own business to compete with Steam.
While the above functions are the same for the four handsets, the OnePlus 7 and 7T are offered Dolby Atmos support for wireless Z headphones and support for 960 fps slow motion video recording. The company has done some technical work to provide the 960 fps function for OnePlus 7T and uses some form of interpolation to generate the 960 frames. However, it's amazing to see such efforts in a non-priority device like the recently released OnePlus 8.
Below you can view the full change log for OnePlus 6 series and OnePlus 7 series.
OnePlus 6 and 6T: Features and change log
- Updated launcher version to 4.1.6
- Updated Android security patch to 2020.05  Improved system stability and general bugs fixed
Phone  The problem with the default country for supported dialing has been fixed when SIM2 is in roaming status.
OnePlus 7 and 7T: functions and change log
- OnePlus Bullets Wireless Z can now be integrated into Dolby Atmos for better sound quality
- The volume control has been optimized to improve the user perience
- Improved user experience with battery life
- Improved system stability and general problems fixed  Updated Android security patch to 2020.04
- Supports 720p slow motion recording at 960 fps (7T series only))
- Add lens spot detection
- Newly added epic games in the game room (only India)
The update is provided through OTA, so it may take several days for everyone to be considered Units are reached. However, you can try to force the update to be checked via the Settings >> Check for updates menu. It is of course recommended to back up your data before proceeding with the update.