HMD has started pushing December Security update to Nokia 6 after Nokia 3, Nokia 8 and Nokia 5 in global markets. The update is available for Nokia 6 in many markets already. But it is not available for the Indian Nokia 6 variant yet. 

Update (22/12):

On our timeline we have tips from many Nokia 6 users across the globe who are receiving December Security update. After installing the Security update they are also able to get Oreo Beta by going to Beta Labs. Do let us know in comments if your Nokia 6 has received this update already.

A new December security update for Nokia 6 will be available in India shortly. Once you have updated to the December Security update you should be able to get the Android Oreo Beta too for your Nokia 6.

As you can see in the screenshots above the December security update for Nokia 8 is 117.4 MB in size.  You will either be prompted to download this update or you can check by going to Settings and searching system updates and then by checking for the update.

Nokia 6 December Security update changelog:

The changelog for the update mentions the December Security patch that brings many fixes for vulnerabilities along with improved system stability and user interface enhancements. Read the full changelog for December Security patch update by clicking here.

HMD has been quite consistent in terms of releasing Monthly Security updates and OS updates for Nokia smartphones already available in the market. HMD has also made it clear that all Nokia Android Phones will receive minimum two years of OS update support.

Thanks M Qasim for the tip & screenshot. Cheers!!