Technically all it means, if the error is as advertised, is that the uefi bootscript failed to match. Now, it could be as simple as that UEFI was customized by a vendor. Or it could be something less innocent.
I just reflashed my bios and then rechecked stuff, same thing... I did more research and s3bootscript seems to be associated with secure boot. Which I have disabled.
-- clarification
Technically all it means, if the error is as advertised, is that the uefi bootscript failed to match. Now, it could be as simple as that UEFI was customized by a vendor. Or it could be something less innocent.