Board Thread:Plants vs. Zombies 2/@comment-26127523-20180410161559/@comment-11660317-20180410162631

There's a file named pp.dat which the game will save in. It will not be deleted if you only delete the app. Because of that, every time the app is updated or reinstalled, you'll have to redownload the progress from the file as well. However, there's still a small chance the pp.dat will be reset for some reason, but works most of the time anyway.