HMD started pushing September Android Security update to Nokia 6 globally some days ago. But since Indian variant is Amazon exclusive and comes with some pre-installed Amazon software it didn't get the update simultaneously.
But now Nokia 6 is receiving the September update in India. The update is 143.4MB in size.
Nokia 5 received the Android September patch update even before Nexus and Pixel devices. Nokia 6 followed it and received the update after few days. Now, it is the turn of Nokia 8 to get the September Android Security update. Though Nokia 8 is not yet available in many markets
HMD has done it again. Nokia 5 is the first Android smartphone to get the September 2017 Android Security update before any of the Google's own Pixel or Nexus smartphones. Google has not pushed September Security patch to its own devices yet and has not even posted the security Bulletin