OnePlus pledged to provide Project Treble support for some of its older flagships, such as the OnePlus 5 and 5T, and even took a step toward fulfilling that promise by including this feature in one of the Open beta programs. builds of OxygenOS that were released not long ago. stable OxygenOS build is made both in the OnePlus 5 and in the 5T and although it is not mentioned in the changelog, the update brings with it the promised support for Project Treble. Although not a consumer-oriented feature, it helps developers and phone manufacturers send software updates faster.
If you have already installed the new Oxygen OS 5.1.5 update on your OnePlus 5 or 5T, your smartphone now supports Project Treble. Apart from that, there are a few other improvements included in the update, such as the option to confirm the pin code without tapping √ to unlock the phone (Settings / Security and lock screen / Screen lock / PIN).
The 1.6GB update also adds the August security patch, the latest security update from Google. If you have not yet received the update, please give it a few days because it is a phased implementation.