Manjaro boot error vmlinuz-5.8 not found

[Zesko]

The similar issue:

Boot error vmlinuz-5.4 not found

Hello I stopped an update yesterday and now my laptop won’t boot, it only shows a black screen with the message: error: file '/boot/vmlinuz-5.4-x86_64' not found. error: you need to load the kernel first. I have some very important files in the laptop, is there anyway to recover them?

Linux Kernel 58 was removed by some accident of pacman.
You need boot into a Manjaro LIVE ISO on USB to fix your system with the command
sudo manjaro-chroot [mount with your system partition]
Password: manjaro

Then sudo pacman -Syyu linux54

Then reboot.