Because HackBGRT modifies critical boot pathways, strict platform security measures must be accommodated:
. By dynamically injecting a custom bitmap into the system's Boot Graphics Resource Table (BGRT) , it bypasses rigid motherboard firmware restrictions without risking a permanent BIOS flash.
Original OEM logo: 1 second With custom 4K PNG → BMP: still 1 second. No delay. hackbgrt151 high quality
: If your custom logo appears for only a fraction of a second before Windows loads, this is often a feature, not a bug. Try setting enable-overwrite = true in config.txt and ensuring your timeout value is not set to 0 if you want a longer display. The original manufacturer logo may also still flash for a moment—this is normal and cannot be changed.
If you have a system currently suffering from low-resolution boot logos, here is how to fix it using the stable v1.5.1 framework. No delay
Given the technical difficulty of creating a perfect 24-bit BMP at the exact native resolution of every monitor, a community has emerged around sharing assets. Look for "HackBGRT151 Assets" on:
Standard boot logos are scaled using bilinear interpolation, which looks soft and blurry. A high-quality HackBGRT setup ensures 1:1 pixel mapping. If you have a 3440x1440 ultrawide or a 3840x2160 4K panel, your boot logo should be razor-sharp. The original manufacturer logo may also still flash
If Secure Boot is enabled, you will need to authorize HackBGRT's boot loader. Upon reboot, you may see a blue screen from MokManager . This is the tool that manages Machine Owner Keys (MOKs). You will need to: