Here are the notes I saved for myself, in case it helps anyone:
How To Flash Ubuntu Touch OS from windows 10:
First and foremost, backup your "persist" partition. Better safe than sorry. Instructions are in other guides, Please, do not skip that step, there is no other way back to the vanilla persist partition.
Download Google USB driver from https://developer.android.com/studio/run/oem-usb#InstallingDriver
Extract driver, edit android_winusb.inf and add the following lines, save, close.
;F(x)tec Pro1
%SingleAdbInterface% = USB_Install, USB\VID_18D1&PID_D0
