From the attached picture you can see what is on the screen ever since I cloned an SSD to replace the used HDD originally installed in this unit.
I first see the NUC splash with the function choices, then it goes to this screen. I can complete the boot by typing "exit" after the Shell> .
Not a big deal but a nuisance.
FYI: I still have issues with an update for the Serial IO I2C ES Controller that the 20.100.1830(Installed) is newer than the (latest)604.15063.3024.59921
It does look like the version has improved from a year ago when I opened a ticket on it.
Not really a problem, just another nuisance.
The update is older than what I have installed when I tried to install the file. (see attachment) It's what's been happening for the past year. No problem, just the utility keeps telling me I have an update.
On the shell issue, I didn't really want to start from a fresh install so I restarted with my Win10 iso flash drive. It rebooted fine and then I shutdown, removed the drive and powered on. No problems here, I guess it found the missing file and put it back in the system.