https://forum.manjaro.org/t/trouble-booting-with-linux49/49265/2

sudo mount /dev/sda3 /mnt
manjaro-chroot /mnt
mount /dev/sda2 /boot
pacman -U /var/cache/pacman/pkg/linux49-4.9.105-1-x86-64.pkg.tar.xz
umount /boot
exit #chroot
sudo umount /mnt