Error: file `/boot/vmlinuz-6.1-x86_64’ not found

When I boot up my laptop I get

error: file `/boot/vmlinuz-6.1-x86_64’ not found.

error: you need to load the kernel first.

Press any key to continue…

Failed to boot both default and fallback entries.

Press any key to continue…
When my plasma desktop froze I tried to reboot but I think I screwed something up

boot into manjaro live usb, make sure you are connected to internet, open terminal and chroot:
manjaro-chroot -a
rerun update:
pacman-mirrors -f 5 && pacman -Syyu
if there are errors post the output here, if there are no errors and you are up to date, post output from:
mhwd-kernel -li && mhwd -l -li

I don’t have a manjaro live usb, and neither another computer to make one

your kernel is broken, so you need chroot to repair it…

What happened is, that you killed the currently running update with this.

The only solution is to boot from a live USB and fix this.

If you have timeshift snapshots enabled, you’ll need to boot from one to restore your system.