my kali is installed in /dev/sda6
my efi partition is /dev/sda2
and yes i understood your post and i replaced the asterix accordingly.unfortunately even using bootrepair disk via ubuntu live disk doesnt work, says an error occured, i think the grub install is corrupted but if thats the case it must be an issue in the weekly kali distro.
cos i can install ubuntu just fine and see ubuntus grub.