Can't install open gapps on 18.10.0 (FP open)

[AnotherElk]

@yves_ebnoether

Since then, my FP2 will boot showing only the TWRP screen, I cannot figure out how to get to the normal phone function.

Sounds like you installed TWRP into the boot partition, but it needs to go into the recovery partition.
If so, here’s another case … solution in the end was to wipe the phone (deleting all data) and install from scratch …

FP2 cannot install Fairphone Open 17.10.1

You could try the TWRP way to completely wipe the phone and make a clean install from scratch … I found that to be very helpful and reliable when trying out different OSes. Attention! This will remove the installed OS and all your data from the phone (which most things labeled “factory reset” on the Fairphone 2 will not completely do). Get TWRP running as recovery (skip this step if you have the latest version running already): Download the latest TWRP image from the “Download Links” sectio…