System bootlooping after TWRP installation I have installed TWRP through Odin, then I booted it. I only seen it, I haven´t done anything, just rebooted to the system again, and it got stuck on trying to boot the system.

It's Samsung J7 Prime with Oreo, Odin 3.13 and TWRP-3.2.3-For-Galaxy-J7-Prime.tar

So, what the hell? Why is it not booting? Any idea?
Can you boot into TWRP? If you can I would try these steps:

Boot into TWRP

Once TWRP is booted you first need to wipe your /data partition or go into Wipe &gt; Advanced Wipe and make sure Data is ticked then swipe to wipe.
If this is your first boot into TWRP: swipe Wipe &gt; Format Data from left to right and follow the instructions displayed onscreen.

Once it's finished go back to  the home screen and swipe Reboot &gt; Recovery from left to right. TWRP should be able to mount your data partition.

Now flash the no-verity-opt-encrypt zip you downloaded from this link, put it on an SD Card and flash it by going to Install &gt; %zip location% This zip prevents your phone from bootlooping since Android Oreo uses dm-verity to prevent modification to the system.

You are (hopefully) now able to reboot to your OS without bootlooping.
Hope this helps.