It is expected that Nokia 6, Nokia 5 and Nokia 3 will get the stable Android Oreo update by early 2018 (Nokia 8 already have got the Oreo update). Oreo update will bring like Picture-in-Picture mode (PIP), notification dots, Adaptive icons, Keyboard navigation, Background limits, Auto-fill passwords, Google Play protect security scan and much more.
Now, if you would like to try out the latest Oreo on Nokia 6, you can join for the program right now. After joining the beta program, users will get the software update via OTA (over the air). Keep in mind that this is a beta release, so it might includes several bugs that are not yet identified. You may experience unknown errors while using it. We recommend not installing it on your prime device.
How to Join Nokia 6 Oreo Beta Program
Step 1: Go to Nokia Beta Labs and sign up for a membership. (You can use your Facebook, Google+ or your email address for sign-up). Step 2: After sign-in, you will need to input your device’s IMEI number (Get it by going to Settings > About Phone > Status > IMEI Information). Step 3: Now, enter Network Operator (Get it by going to Settings > About Phone > Status > SIM Status > Network) Step 4: Accept the beta software license terms and register for beta labs. Step 5: After approval, you will get the Oreo Beta software update via OTA (over-the-air). (Source)
