The image must be a proper 24-bit BMP file. If it is not formatted correctly, the logo will not display properly.
Released on 11 August 2018, version 1.5.1 was primarily a maintenance and refinement update: Clarified Configuration : Improved documentation within the config.txt file to help users set custom coordinates or image paths. UEFI Setup Fix Hackbgrt-1.5.1
Double-check that Secure Boot is definitely disabled in your BIOS, as this is the most common cause of failure. The image must be a proper 24-bit BMP file
Modifying boot files is never 100% risk-free. Before using HackBGRT-1.5.1, keep the following in mind: Hackbgrt-1.5.1
Download the latest HackBGRT release (1.5.1 or newer) from GitHub.