How can i revert to a previous Open edX version?

After a successful install of ironwood.master - how can one revert to ironwood.2 or even a previous hawthorne version?

What I have tried so far:

  1. I saw an option in lms.env.json and cms.env.json to change the version so I have changed this and then compiled assets via pavel. Once completed I then rebooted but unfortunately this didn’twork

  2. I then tried checking out a the open-release/ironwood.2 branch. When I entered the following command: sudo git rebase master command I came into significant errors that I kept having to skip.

Can someone tell me what is the best way to do this without having to launch a fresh instance and a fresh install?