OnePlus posted a new update software for your OnePlus 3 and 3T aimed at the stable OxygenOS channel based on Android Pie. the changes It is identical to both smart and very concise telephones:
- Update of Android security patches in June 2019.
- General improvements and minor bug fixes.
READ OUT: OnePlus 3T, the review
Distributing update via OTA to all who have installed the version stable more recent than OxygenOS. OnePlus has specified that they have boot loader unlocked and we will try to manually install this new version, they will lose all the data stored on the device. Below is the document download link of the respective ROMs useful for manual installation.
OxygenOS 9.0.4 for OnePlus 3 | download
OxygenOS 9.0.4 for OnePlus 3T | download
Source: OnePlus Forum