I have moved my esp partition around month ago, but earlier I started to delete not necessary file (I think it was not necessary). After moving system do not boot. I do many think to made it working, but at least I must reinstall system (Grub2 was better - only few commands to restore system). I stopped on system not booting with message it was unable to load kernel command line (or something like that).
After reinstall, old boot entries (from old system) preserves. What to do to delete bad/not current entries.