After months of waiting and delays, OnePlus has finally released OxygenOS for the One. Now, you can download and install OxygenOS, which is based on Android 5.0 Lollipop, on your OnePlus One. The download instructions and installation file are present on the source link.
The file size of this update is 739.7MB, and it brings Android 5.0 Lollipop to OnePlus One. There is still no final date in sight for the release of Cyanogen OS 12, which is also based on Android 5.0 Lollipop. All the users in India can install, OxygenOS, and comes with stock Android UI, but also adds custom features like Clear Image, and lockscreen gestures.