Secure Boot or BitLocker is enabled. Fix: Disable Secure Boot in UEFI settings. Suspend BitLocker (if used) via Manage-bde –protectors –disable C: .
gfx-boot-customizer-mirror – Unofficial repository with source code analysis.: Beyond just the background, you can change the system logo, progress bar images, and the style of the text. gfx boot customizer 1.0.0.6 285
Integrity checks detect modified boot resources. Fix: Restore original boot screen before launching such games. Use the “Game Mode” toggle in the tool (if available) or temporarily restore. GFX Boot Customizer 1
Due to the sensitivity of modifying boot files, the program typically requires administrative privileges. Reddit: r/bootcustomization – Active threads on GFX Boot