The MSI leak comments like https://sizeof.cat/post/leak-intel-private-keys-msi-firmware... mentioned the bootguard keys maybe have been common to other manufacturers: "It is assumed that the keys for downloading the guard are not limited to compromising MSI products and can also be used to attack equipment from other manufacturers using Intel’s 11th, 12th and 13th generation processors (for example, Intel, Lenovo and Supermicro boards are mentioned)"