I cant update my Lumia 635 to windows 10 mobile build 10166 slow ring. If im install they have an error 80070003. I have 2,57 GB of free storage. I cant update. Please help.
What are you currently running? Do a soft reset and try again. If you are running an old wp10 build, you may need to use WPRT to go back to 8.1 and try again. People have run into different problems updating.
I had an issue with my 640. I suggest you try a reset/recovery (perhaps even with Windows Recovery Tool) and try Fast Ring. The builds are the same on both rings right now. You can switch to Slow Ring later.