I don’t think it’s even possible to perform a downgrade of a current install right now, especially with the move from GNURadio 3.7 to 3.8. I’ve asked this question before and been met with only silence.
It may be possible to grab a much older image (possibly this one from 2019: https://gitlab.com/librespacefoundation/satnogs/satnogs-pi-gen/builds/artifacts/2019091100/raw/deploy/image_2019-09-11-Raspbian-SatNOGS-lite.zip?job=release ).
However, I’m not sure the image comes with all the required dependencies, and an upgrade will immediately bring in the latest versions of everything unless the git repos are set to a specific tag. I’m not sure how to do this, or what tag to use…
And yes, it looks like the doppler correction isn’t running correctly in that waterfall. It sucks that there isn’t an obvious solution to this, and that there isn’t an easy way to downgrade.