The instructions for the Zyxel NSA325 are missing a step

[jeajea]

When the installation is complete you need to edit /etc/fstab and add the following line

$this->bbcode_second_pass_code('', '/dev/sda1 /boot ext2 defaults,noatime 0 2')
If you don’t pacman –Syu doesn’t update the kernel on /dev/sda1.
This may also be a problem for the NSA320 and NSA310

[WarheadsSE]

This is a case for many platforms that have a split root/boot. We expect you to take care of this.