We built beowulf installer images for armel, armhf and ppc64el. If you
have appropriate hardware, please test and report.

armel (no mini.iso for these. I hope you know what to do.)
https://pkgmaster.devuan.org/devuan/dists/beowulf/main/installer-armel/current/images/
    kirkwood/netboot/marvell/{dreamplug,guruplug,sheevaplug,sheevaplug-esata}
    kirkwood/netboot/seagate/dockstar
    orion/netboot/buffalo

armhf
https://pkgmaster.devuan.org/devuan/dists/beowulf/main/installer-armhf/current/images/netboot/mini.iso

ppc64el
https://pkgmaster.devuan.org/devuan/dists/beowulf/main/installer-ppc64el/current/images/netboot/mini.iso

Thanks,
fsmithred