if ~ error: file `/boot/vmlinuz-5.13-x86_64' not found.
- Boot an image from usb using Ventoy (in mormal)
- On a terminal:
sudo su -
lsblk --fs
if the FSTYPE of your system is ext4, run these commands (if it's not, see this instead: https://forum.manjaro.org/t/howto-recovering-from-an-interrupted-update-upgrade/132762)