Do at your own risk. Under no circumstances shall the author be liable for any damage.
Technically NesUEFI should not mess with your system. But you should at least know what you are doing.
- Format a pendrive with FAT32 file system.
- Create /efi/boot/ folders in the pendrive
- Copy bootx64.efi file to boot folder.
- Copy splash.bmp on the root folder of the pendrive
- Place your .nes roms in pendrive.