@kugiigi Anyway, I'm back in, thanks a lot for your tip

@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!

@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 Indeed!

@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...