I went to W10M from 8.1 on my 520 today. Via the windows insider app to build 15086.29 and noticed there's no preview mark in info. It just says w10 mobile. Also "not for resale" on startup is gone. I have been on w10 before. Is this normal?
Well 10586.0 and 10586.29 are the builds that were released on the new Lumia phones, 550/950/950XL, so I would technically think that they aren't "preview" builds.