Earlier we wrote about the Closed Beta based on Pie, but now OnePlus found it stable enough, they pushed it to the beta branch. Many users already found the leaked Closed Beta stable enough, so the Open Beta should be even more stable.
For who is the Open Beta meant to be used?
If you're eager to try out Pie and are up to submit bugs at OnePlus, you'll really like the Open Beta based on Android Pie. If you don't want to deal with bugs, it is recommended to wait for the update to come to the stable branch. Mind that we don't have an exact ETA for when the Pie will come to the stable branch, but personally I expect it to be within a month, since OnePlus is also working on OxygenOS for all the other devices, plus the upcoming OnePlus 7-serie.
In the end it's all up to you if you want to want to install the Open Beta or not.
So how do I install this update?
First of all, we want to tell you that we will add the Open Beta to Oxygen Updater and even newer builds (if newer betas wased on Pie will come). We'll keep doing the same thing for the stable-branch.
If you are running the Open Beta, which dates from the summer of 2018 and you want to go to the Community Beta based on Pie, you can do the following: go to the settings of Oxygen Updater and set the update method to 'Android P Community Beta'.
You do the same if you're running the stable but you want to go to the Android P Community Beta.
As explained in the post of a OnePlus employee:
For those on the latest stable version 181206
For those who are on the latest Open Beta version 180712