Found!  Not a file but settings in the Bios.  I disabled UEFI for updates. Issue solved via Google search.
How to prevent bios update after reverting back to previous version.  I have identified an overheat issue with v1.9 and reverted back to v1.8 which solves the issue.  Problem is each time I restart the system it automatically reverts to latest bios version.  Suspect a file exists that upon restart it pushes the bios to the latest.
vostro 5501 bios update issue