HackBGRT is a free Windows boot logo changer software for UEFI systems that lets you change the default boot logo of your computer. It supports UEFI based Windows systems.

The secure boot disabling and efi changes are needed to change the boot logo to the Windows 7 starting screen via HackBGRT (it's not LogoFAIL vulnerable).

Here are Microsoft's own guides on building a Windows To Go drive, native booting from VHDs on a USB drive, as well as editing Windows boot files with BCDBoot and operating DISM via Command Prompt.

If you need to change your computer's UEFI (BIOS) settings, this guide will show you two ways to do so on Windows 10.