FP2 doesn't connect to Win 10 / problems with USB

[OldRoutard]

Hi jhf and welcome.
I experienced a similar problem.
I advise you to update the Windows driver, through the standard Windows update facility. See here:

FP2: no connection during fastboot from Win 10 PC

I can confirm, having encountered the same problem myself. Windows 10 users should use the general Windows update service (Settings > Update & Security > View optional updates > Driver updates). There are two drivers to update, Android Composite ADB Interface and Qualcomm (if I remember correctly). Once you’ve rebooted, fastboot works fine! But the time I wasted messing about before I got there, doesn’t bear thinking about