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Yeah, and for that printer, sometimes just unplugging it and restarting your PC before plugging it back in can clear that Code 43 error.

Yeah, that was the key for me too. Also, make sure you save and exit the BIOS completely after changing it, not just a quick restart.

You could also check if Secure Boot is enabled in your BIOS, as that's another common requirement that sometimes gets overlooked.

This happened to me with a similar older CPU. I got the TPM and Secure Boot sorted, but the unsupported processor was the real blocker.