I was on release preview brach (14393.726) and change to fast ring RS2. I downgrade my phone to 8.1 because RS2 build bugs. Now im on 10586.107 public build. How can i get RS1 builds. Which branch should i choose to get RS1 builds...?
I don't think you can get back to RS1 on insider builds (except maybe release preview), but you should be able to get a regular update for your phone (assuming it officially supports Anniversary update).