then remove
sudo rm /boot/initramfs-5.8-x86_64-fallback.img
sudo rm /boot/initramfs-5.8-x86_64.img
sudo rm /boot/vmlinuz-5.8-x86_64
sudo rm /etc/mkinitcpio.d/linux58.preset
sudo pacman -Qs linux58-
sudo mkinitcpio -P
then remove
sudo rm /boot/initramfs-5.8-x86_64-fallback.img
sudo rm /boot/initramfs-5.8-x86_64.img
sudo rm /boot/vmlinuz-5.8-x86_64
sudo rm /etc/mkinitcpio.d/linux58.preset
sudo pacman -Qs linux58-
sudo mkinitcpio -P