OPPO has started rolling out Android 6.0 Marshmallow update to the Oppo R9, R9 Plus, and F1s smartphones. The update is currently available for Australian units of the smartphones.

"OPPO R9 android smartphone"

“An extra benefit to upgrading to the latest version of the ColorOS is that it will allow the OPPO R9 Plus and R9 to have a dual-sim function with 4G+3G compatibility,” OPPO says on its Australian website.

There’s currently no information on when other regions/markets will get the update.
.

Also Read:  European HTC 10 units gets an update with camera and WiFi-related improvements