No wifi after hard freeze during AUR package installation

it will display it at boot as an option to select in grub. But you have to refresh mkconfig. Please make a backup before making system changes.

  1. Install kernel sudo pacman -S linux-lts linux-lts-headers

  2. Then update grub config

grub-mkconfig -o /boot/grub/grub.cfg

See arch wiki

This post explain nicely why lts kernel