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to add those Kaspersky keys to the UEFI Revocation List File, which is jointly managed by Microsoft and the UEFI Forum. This file in turn updates the Secure Boot Forbidden Signature Database, dbx. Apparently, that update caused havoc with the HP utility referenced in this post. If you installed the two updates described in this post and didn't encounter any issues, you've successfully blocked those Kaspersky UEFI keys from being misused. If you did encounter issues, you should uninstall the update and await a revised version.