In Google Apps can’t be reinstalled I have posted how I could solve this problem for me using the new Storage Upgrader and the Fairphone OS 1.8.5 for unified partition together with the tool ADB available for both Windows and Linux from Google Developer tools. Of course I cannot guarantee that it is working same way for you as it was for me, so I cannot guarantee anything. If you use my guide then you do at your own risk!
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