How do you install a previous version of Supervisor on Docker?

Many of us Home assistant Docker supervised users are having Serious snapshot issues and are unable to do ANY upgrades/updates or snapshot restores with the 2020.12.2 Supervisor.
Can someone please point me to the method used to do this?.

I’m dead in the water right now as are many, many others.

How does one manually downgrade Supervisor specifying a Specific version under docker? There has to be a way to do this but my searches haven’t uncovered the solution.

Jeff