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Answers to your questions, one by one: How are the microcode update files published? They are simple, rather small, files, published by the processor makers. How are they loaded into the CPU? Your processor comes with an initial version, that it boots up with. Your processor has a sequence of instructions to initiate a microcode upload. The BIOS/UEFI ...


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Given a system in an unknown state, it is, as others have said, very hard to detect backdoors.There are various tools you can use but a proper discussion of them goes somewhat beyond the scope of a post here. However, given a system known to be in a good state, it is possible to detect any modification of its state using a host based integrity detection ...



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