You can install Grub4Dos to the Master Boot Record (MBR) of a USB drive or hard disk to make it the primary bootloader.
The most current versions, including those with UEFI support, are often maintained on GitHub by chenall . grub4dos boot iso download
To get started, you need to download the latest stable version of Grub4Dos. You can install Grub4Dos to the Master Boot