hifiberry-digi on pi4 not working.....

[Skywatch]

I just did my first upgrade in a while.
... and I cannot get the digi recognised on pi4 (01.01.21)

aplay -l gives no available devices. The device was working on pi3 before I moved it across.

I managed to install alsa-utils fine, but get an error when trying to install alsa-base (no available candidate) = Also get the same trying to install yarc, but that's another thing I think

So what's changed with pi4 and how should I proceed from here?