Clean Installation Guide for OxygenOS 3.0 on OnePlus 2 [Beta Build]

Some of you know, soak testing for OxygenOS 3.0 (based on M) started a few weeks ago, and now OnePlus ready to share it with us. OnePlus still want to ask the community for help to make sure OnePlus work out any remaining kinks before OnePlus OTA the build officially.
What’s available today is a daily-driver-material community release of 3.0. If you’re the type who won't mind rolling up your