lsblk -f
su
mount -o subvol=@ /dev/<sdyC> /mnt
mount /dev/<sdyA> /mnt/boot/efi
manjaro-chroot /mnt /bin/bash
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck
grub-mkconfig -o /boot/grub/grub.cfg
update-grub
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