If you have not received the OnePlus 6 OxygenOS 9.0.1 OTA update notification yet, check it manually by opening the Settings app and then go to System updates. Alternatively, you can download and install the full OTA update (link below) via Local upgrade method.

As said above, the new OxygenOS 9.0.1 update for OnePlus 6 does not include any major changes. The update log is same as OxygenOS 9.0, which was released a month ago. What’s new in OxygenOS 9.0.1? If you have not received the OxygenOS 9.0.1 OTA notification yet on the device, you can use the Oxygen Updater app to get the update right now without waiting for the OTA. Brand new UI for Android Pie New adaptive battery support New Android Pie gesture navigation Updated Android security patch to 2018.9 Other new features and system improvements Do Not Disturb mode New Do Not Disturb (DND) mode with adjustable settings New Gaming mode 3.0 Added text notification mode Added notification for 3rd party calls Accent color Supported accent color customization Alternatively, you can download the full update package (1.5GB) from OnePlus download section [here] or directly [here] and flash it manually as described below.

How to Install OxygenOS 9.0.1 on OnePlus 6

  1. After downloading the full firmware, save it on your phone and then open the ‘Settings’ app.
  2. Go to ‘System updates’, tap on the top right corner icon and in the menu, tap on Local upgrade.
  3. Choose the upgrade package and then immediately upgrade. System will start the upgrade process and reboot. (source)