But it also shows that it's exactly the same like before, so it seems it was either an incredible buggy temp root, or no root at all. After a restart of the phone, luckily everything is completely normal again. When I selected to unroot in Kingroot, I got a ton of closed applications messages, and even my launcher has crashed. The settings app always crashes instantly. Even worse, I have a lot of other services and apps crashing, mainly Google Play services. The app 'Root Checker' confirms that there is no root access on the system, so it wasn't successful.
The content is black for 10 seconds, and then it crashes. Only Purify is installed after that, but it's not able to start up. It's not logged in it's 'Records' menu ('Waiting root request'), apps like KingUser aren't installed.
The program says it had success to root the device, but it's not able to progress any further. I have used the Moto E 2, model XT1524 (Android 5.0.2), no success.