The new version FAI is available in two variants. FAI 5.8.4 is for Debian buster and FAI 5.8.4~bpo9+2 is the same for the stable distribution called stretch, including the configs for stretch.

You can get the packages when adding one of these lines to your sources.list:

deb stretch koeln


deb buster koeln

New FAI ISO images using stretch are now available from [1]. The FAIme build service [2] for customized cloud and installation images also uses the newest FAI versions.