Nokia Mobile started releasing the latest Android P DP3 build for Nokia 7 Plus users around the world. First of all, you should know that this is the beta software so you can expect to see some bugs there. The update marked as V3.110 is available over the air (OTA) for all the developer preview users registered at the Nokia Beta Labs. The program currently supports models TA-1046, TA-1055, and TA-1062, except China builds, which are currently not supported. If your Build Number is “00WW”, then you can install the Android P build. On the other hand, if your build number is “00CN”, then you should not download the build since it is a China build with specific requirements.
For more info definitely visit the Nokia Developers page. Personally, I wouldn’t risk perfectly working Nokia 7 Plus, but if you miss all the Developer Preview action from Nokia/Microsoft Lumia days, then go have fun.