It’s an Intel system. XTU is not supported on mobile core ultra. You get an error of something like, “tried to install on unsupported hardware”. XTU also isn’t the BIOS.
Intel Undervolt, from my understanding, works on the same premise as the Throttle Stop utility I mentioned above. Throttle Stop however doesn’t allow for the usual tuning like on older hardware; those options are greyed out and not selectable. It allows for disabling boost entirely or adjustment of “Speedshift EPP”.
Undervolting was prevented starting with raptor lake and deployed via BIOS updates as mentioned in this Reddit article. This would make sense as to why XTU doesn’t work since it is specifically mentioned. Reddit - The heart of the internet