@Luksus You were right. I had to use the kernel I built and increase the system partition. I took 1.5 gb from system_b and added to system_a and now it works. Thanks for the hint.

@ancientsounds It was merged, I cloned the repo and built it. I also added for fun binfmt and tried Winebox and that worked. I think Snapz0r crashes during setup. I realized that when you hit enable snaps after some time the phone actually reboots and nothing can make the oneplus 6 reboot you usally only get a black screen and have to hold the power button you're self to make it reboot. That makes me think it crashes. Can't find any logs though.

Did any of you got it working? I tried install dev form ubports-installer didn't work, I also build the kernel my self and same thing the app tells me that the kernel have support and after I hit "enable support" and reboot same thing a X and kernel has support "enable support".

@Luksus Ok. Sounds like that could be it. I will try to resize later today and see if that resolves it.