My FusionHub solo, in Hyper-V, updated to latest 8.1.3. shows this error on boot. Reinstalled it a couple times. Original vhd is OK and only appears after firmware update.
Just to confirm after sometimes the FusionHub still able to boot into the system and started up ?
The VM hangs waiting for that key press. After 6 seconds it will resume the boot on its own, and runs normal.