How to Fix Broken Grub (EFI)

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If you find yourself with an overwritten GRUB, follow the below links and commands

Create a system rescue live boot USB and boot into it and select the first option (default/normal presets)
Once in, make sure you mount your broken system to /mnt/linux! This is very important as the system will FREEZE if you mount directly to /mnt
After mounting your main drive (presumably /dev/sda2 (yours may be different)), mount your boot drive to /mnt/linux/boot/efi (if it does not exist, create the folder with mkdir)
After mounting your boot and main drive, mount your home drive if you have one (if you do it would go on /mnt/linux/home)
FOLLOW THIS LINK INSTRUCTIONS: IT GOES VERY IN-DEPTH
- Make sure you are following the second example where they chroot into the broken system.

It should be a success, congratulations, your grub is repaired.