Thanks man, you are my hero! I had the problem, that I get the error "Authentication required sign in into Google Account" but I already was logged in and I couldn't install any app. So I did what you did (remove data of Google Service Framework). In addition I cleared Google Play Store as well as "Google Play Service" (here you need to tap "Manage Space" and then "clear data"). Then open Play Store (you migh get an error first). Just close the app and restart it, now it should work and the problem should be fixed. Thanks again dude!