I will get s-off through the HTC One All in one toolkit. But on the ARHD topic, this was posted aswell:
HTC One unlocked with htcdev.com (S-ON) or S-OFF
Firmware package from here (recommended but not needed for now)
Read this flashing guide - [GUIDE] Complete Flashing Guide | Rooting | Going Back To Stock
So i tried to get the latest firmware, and that's where the problems started. But shouldn't it be better to have the latest firmware? I mean it stands there for a reason, right? Or am I wrong?
Anyway, i will try ARHD for now, it looks nice