Board Thread:Friend Code Exchange/@comment-32723228-20170730084416/@comment-28260694-20170805141451

That's of course the best way. But if you lost more data and if you are on windows and you have a possibility to create an  ubuntu usb stick

https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-windows?_ga=2.3236720.1561475523.1501942167-2078309623.1501942167#0

you could go in and save all your data and then put in the data in the local state and you get all your game back.