I did it and e is working on my phone! The problem was optional updates in Windows. While it did block the installation of the Google USB driver, I stumbled upon optional updates in the update folder, when clicking on them I found 3 ( Android ADB Interface, Kedacom USB Device and LeMobile Android Device). I selected all of them and Win downloaded something and then rebooted (important to note with my FP3 connected to an USB 2.0 port). After reboot I found the LeMobile driver installed and after that I was able to access fastboot.
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