There are basically two different ways of making sure that the Android P is properly installed on the phone that you have. The first method is a relatively easy one. For that, you have to make sure that you are signed up for the Android Beta Program. You will be able to get the update for it over the air as well. Apart from that, there is the method of flashing the beta build that the OS has into the smartphone. However, this method can get a bit complicated.