I just tried the installer on a FP3+ tonight, and it worked 
Before my install with the UBports-installer, I had tried to install using this guide: https://forums.ubports.com/topic/5373/fairphone-3-fp3-port
That was not successful, and left the phone without any working OS. In this state, I tried the new Ubports-installer, and all my troubles was gone ! Great work ! Thanks !
K
Best posts made by Kjetil
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RE: Call for testing FP3 (also for FP3+) config for UBports-installerposted in Fairphone 3
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RE: Stuck on boot screen after upgradeposted in Support
It worked! I could reflash, and all my data was still there inclusive Anbox
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RE: Recover Authenticator NG settings from recovery modeposted in Support
Reply to myselves and all others in same situation:
- open adb shell to the phone with the new installation
- Go to the Authenticator NG folder: cd ~/.config/authenticator-ng.dobey
- Rename the current config file, in case you want it back later: mv authenticator.conf [newname]
- exit ADB
- Push your saved authenticator.conf to the reight location on the new installation: adb push [local path/authenticator.conf] /home/phablet/.config/authenticator-ng.dobey