I've never seen a user's manual. The only document received was a "Quick StartUp Guide".
Secure boot changed from [enabled] to [Disabled] which triggered a warning:
"Changing this setting may prevent your OS from booting or require a reinstall. Are you sure..."
Boot options priorities 1, 2, and 3 list the following options:
[Windows Boot Manager]
[Onboard NIC (IPV4)]
[Onboard NIC (IPV6)]
I [Disabled] all three.
Since " Enable USB boot support" is [Enabled], I am Saving/Exiting, with the USB inserted.
screen 1: Dell logo
screen2: Initializing USB...
screen 3: SupportAssist is running a system scan to detect any potential h/w problems...
screen 4: No h/w issues were found. Click [Continue] to launch the SupportAssist OS recovery... Click [Cancel] to restart...
Became stuck on the "Where do you want to install Windows?" screen.
Drive 0 Partition 1 Primary
Drive 1 Partition 1: ESP System
Drive 1 Partition 2 MSR (Reserved)
Drive 1 Partition 3: OS Primary
Drive 1 Partition 4 Recovery
Selecting any of the partitions triggered the same error message:
"Windows cannot be installed to this disk. This Computer's h/w may not support booting to this disk. Ensure that the disk's controller is enabled in the BIOS menu."
The " Partition 3: OS" had one additional warning: "Windows cannot be installed to this disk. The selected disk is of the GPT partition style"
Apparently, one of the changes to the BIOS caused this...
Sorry, philpower, we are not out of the woods...