Oh - and don't forget to block updating of the firmware blobs:

If the W has the same Radio-Chipset as the Pi3 (which, IIRC, it has) you can try the following: wget 'http://archive.raspberrypi.org/debian/pool/main/f/firmware-nonfree/firmware-brcm80211_0.43+rpi4_all.deb' sudo dpkg -i firmware-brcm80211_0.43+rpi4_all.deb This will download the firmware files neede...