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As mentioned in the github page that this post links to, it's impossible to make a custom microcode update because the updates are RSA signed.

Except if someone finds a flaw in the microcode loader.

Didn’t they dump the private keys?

Public key

What can do they with the public key vs private key?

Public keys can only be used to verify a signature, not to sign anything.

Was the public key found used to decrypt the microcode?

Why would private keys be on the chip?