Woah, based from the posts here looks like this build works great on my 520. Now I really want to install it. But... I'm quite scared. LOL. It's my first time trying this Insider Preview thing. I don't know what to do. I don't even understand what's a fast ring and slow ring! I am most concerned with my apps, games, and files. Do I need to hard reset my phone? If yes, what would happen to my apps? If not, is there a chance that this build would corrupt them or something? What I understand about hard reset is that it will wipe out all data on your phone. So I guess I need to do a backup?