Bios symbol error (missing certificate) when booting

[myswtest]

Not sure what “Windows” is

I have the options set to On within Discover to check for BIOS updates:

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Discover can update my Dell laptop BIOS?

I was a bit shocked to discover [sic] that Discover offers to update the BIOS on my Dell laptop (??) Is this for real? See my screenshot - I did my due-diligence and investigated. Yes, my BIOS version is at the version shown in the update 23-24 section - I searched at the Dell website and sure enough, 24 is the newest critical update. But my concern was that the “vendor” is “unknown”. And the “distributed by” is “lvfs”. My other concern was file size - the screenshot shows 23mb, but I do…