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