Grub broken after reverting to earlier snapshot

[filo]

Error: symbol 'efi_wrap_1' not found GRUB rescue

Yeah for that stuck at initial ramdisk after update look here: Also the reason for that error after restoring snapshot is that when you updated your system grub was updated as well but rolling back caused it to roll back grub as well. To restore grub you need to chroot into your system using a live usb and reinstall grub.