Comment # 3 on bug 1015599 from Michael Chang

Created attachment 706733 [details]
Test rpm

Hi Jason,

To test the attached rpm package, please follow the step to replace efi loader
in USB install media with the one in the rpm package.

Assuming you usb device is /dev/sdb and your rpm is in
~/Downloads/grub2-x86_64-efi-2.02~beta2-107.1.x86_64.rpm

 mkdir rpmroot
 cd rpmroot
 unrpm ~/Downloads/grub2-x86_64-efi-2.02~beta2-107.1.x86_64.rpm
 mount /dev/sdb1 /mnt
 cp usr/lib/grub2/x86_64-efi/grub.efi /mnt/EFI/BOOT/grub.efi
 umount /mnt

Reboot and see if it works.
Thanks.