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 !

It worked! I could reflash, and all my data was still there inclusive Anbox

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

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

I have a broken phone, where I have retrieved all data via recovery mode and ADB.
I want to reinstall my phone and restore Authenticator NG settings from the data I have saved. How do I do that ? Can I just copy paste from a folder in the old dataset to a location in the new instal?

I succesfully got into recovery mode and can now use ADB. The file manager can see the phone attached as "FP3", but comes with an error "Can not open the MTP-unit 001,013" when I try to browse it.

I have had low space left on my FP3, but not cleaned it up. Suddenly I could no longer open many programs, and finally, I could no longer boot it. I get the Fairphone flashscreen, and then it goes black. I can see that something is running behind the sceenes, because if I attach the phone with USB to my laptop, I can se that it is active in Nautilus file browser. I can not browse the device though.
How can I save my data from the phone?

@mihael Thank you for response !

Unfortunately, my waidroid was uninstalled, and I could no loger install it with "Waydroid helper". I then did:

sudo mount -o remount,rw /
sudo apt install waydroid

and finally your last step:

sudo waydroid init

and reboot.
It works !

After upgrading to OTA-2 on my Fairphone3+, Waydroid stopped working. I uninstalled using Waydroid helper, and even uninstalled Waydroid helper itselves and rebooted. Then after reinstalling Waydroid helper, the install process is stuck with the message "Preparing to download system image".
Any idéas on how to proceed ?

Hi,
I have a old Nexus and a new FP3+, both running Ubtouch and both having working Anbox installations. Is there an easy way to move the Anbox applications on my old phone to the new phone ?

This is really good news. I have just changed channel on my FP3+, and cellular works again. I really appreciate the works done by you all. Big thanks from me

@luksus You are right: no flashing. I booted the vendor image to put the device in developer mode. Then I tried to install without the UBports-installer, but failed. The phone would not boot any image. Finally I tried the UBports-installer, and it installed, and worked !

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 !