Your system must be booting in UEFI mode; Legacy BIOS is not supported.
Version 1.5.1 is considered a legacy version. Users on GitHub forums have noted that while it is effective, it can be less stable on newer versions of Windows 10 and 11 compared to the latest releases. Because it interacts directly with the EFI partition, there is a risk of making the system unbootable if errors occur. It is highly recommended to have a or a full system backup before proceeding. How to Revert Hackbgrt-1.5.1