How to root HP Pro Slate 12 tablet?
Even if there isn't a working root method for Android 5.1.1 devices yet, I found a working solution! The app is called Helium. (https://www.clockworkmod.com/carbon) There is a free version of the program too. It has an Android and a Windows version too. You need to use both of them together. With this app combo you can backup any android apks (with all the settings and their data, not just the apk itself!) even on unrooted devices! Data can backed up to sdcard or cloud too. I have two lollipop devices, both of them unrooted and this program combo works on both of them! So I don't even want to root them anymore. I just wanted to root them to back up my settings and program data.