All chirpstack servers fail to load - Illegal instruction

RPI Zero with latest image and update/upgrade done. Loaded latest chirpstack following the debian-ubuntu guide.

All three chripstack servers (application, gateway, network) fail to load with the same error.

$ sudo journalctl -f -n 100 -u “server”
=> Main process exited, code=killed, status=4/ILL
Same result for all three servers

Running them manually, gets same result for all three servers e.g.
$ sudo chirpstack-application-server --config /etc/chirpstack-application-server/chirpstack-application-server.toml
=> Illegal instruction.

psql running ok (v11.1) and redis running ok (v5.0.3)

Any ideas what to try.

Chirpstack does not seem to be supported on armv6.
move the same SD card to a arm7 (pi3) and all works