Because F.audio doesn't always have a centralized, easy-to-find update site, owners often rely on each other. Common Fixes:
Do not unplug the FA4 during the update. Do not let your computer sleep. Disable screen savers and USB selective suspend in Windows Power Options. faudio fa4 firmware upd
If you are looking for the technical "story" on how to do this correctly, here are the essential steps: Because F