@rapidrotator
This worked for me! I only had to alter the commands, as 'mount' would not show /system and the adb shell did not recognize the mkfs.extX -invocation of mke2fs :
OnePlus3:/ # cat /etc/fstab
Get the block device...
OnePlus3:/ # mke2fs -t ext4 /dev/block/<device>
As the /system-partition was already ext4, I wonder whether wiping the partitions will be enough and the trick is not ticking the 'first install' and 'wipe device' boxes....
Thanks a lot, anyways!
@kugiigi Anyway, I'm back in, thanks a lot for your tip 
@kugiigi Thank you, I only tried a bluetooth keyboard, but that obviously didn't work...
@applee Thanks, yes I tried that, but the login screen doesn't rotate 
The bottom part of the touch-screen on my bacon stopped responding, so I can't unlock my phone anymore. Is there any way to recover my data from the device or at least reinstall ubuntu-touch? Developer-mode not being enabled, the ubports-installer and adb do not find the device...
Any help will be appreciated...
