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This. Agreed, that's a solid approach. Yeah, and just make sure you've backed up anything important on both systems before you start tinkering with the bootloader.

Same here. You could also check if there's a separate "PTT" setting in your BIOS, as that's Intel's firmware-based TPM on that board. Another option is to make sure you've saved the BIOS changes and fully shut down, not just restarted, for it to take effect. Hope that helps.