I bought the lumia 950 xl last night and it only updates till build 218. I tried to switch to the fast insider but it says...up to date...Any advise?
Did you join insider and accept the agreement? Use the insider app to set yourself to production preview. It will ask you to reboot if you do it right. Reboot it and then it should show up in phone updates. If not give it some time. But also update your apps in the store.
Everything else is fine. The store apps update fine..the production builds are installing fine... I used the fast ring on my 1520...it was fine... it doesn't check for updates in the 950XL though through insider.
Here's a question. Did you restore a backup from your 925? Honestly, this could put your phone into an odd state. So I would have started fresh if I was you. If you did just do a factory reset. It only takes a bit of time to get things going and once you do, it's worth it.