Fuck grub2

Reinstall grub2
grub2-install /dev/sda

grub2-mkconfig -o /boot/grub2/grub.cfg

chroot/install grub; rebuild initramfs

for i in sys dev proc; do mount --bind /"$i" /mnt/"$i"; done; chroot /mnt
grub --batch --device-map=/dev/null
device (hd0) /dev/sdc
root (hd0,0)
setup (hd0)
quit
grub --batch --device-map=/dev/null
device (hd0) /dev/sdd
root (hd0,0)
setup (hd0)
quit
dracut -M -f -k /lib/modules/$kernver /boot/initramfs-$kernver.img $kernver
exit
umount /mnt/{dev,proc,sys,}