We know that Android 8.1 Oreo is coming to both the OnePlus 5/5T devices as well as the OnePlus 3/3T. The latter is especially welcome news. There is no specific time table for the updates yet. But we find out more information about it. One of the newest pieces of information we got is that the company will not support Project Treble, a feature that aims to bring faster updates to Android devices. This does this by separating the operating system code from the vendor code, letting vendors push key OS updates to the phones without the need to re-optimize their own codes. OnePlus Staff Member Adam Krisko, who was doing an AMA on the OnePlus Forums, broke the news but he didn’t say why they didn’t intend to support Treble for these devices.
Source: Android Authority