I would think some motherboards require a console connection to get everything booted, configured, updated, etc. Once the NVRAM has all of the setups stored, it's perm, but there is likely an initial configuration setup.
Do you have a lot more information?
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Fleetwood Providence 2008 40e
Ford F-350 4x4 Diesel 6.0L 2006
Honda CR-V 2006
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