lsblk -o NAME,SIZE,MOUNTPOINTS,UUIDtry this command, it will show you what partitions you have on the machine then modify previous command with correct labels and UUID
sometimes you need to modify the command
sudo efibootmgr --create --disk /dev/sdX --part Y --loader “\EFI\systemd\systemd-bootx64.efi” --label “Pop_OS” --unicode
/dev/sdX --part Y needs to be replaced with correct labels for partitions, If you are lost just paste the output of the lsblk -o NAME,SIZE,MOUNTPOINTS,UUID command