- does it frozen during update ?
- you have also lost GUI interface ?
- repair with fsck partitions
- with USB iso live manjaro
open a terminal and browser on this topic
sudo manjaro-chroot -a ( type 1 if only one line appears )
pacman -Syy
pacman -Syu
mhwd-kernel -i linux57
exit ( quit chroot )if error on update - hook , exit for end chroot
return all error message