It’s not recommended. Going back from Vangelis to Oram is not a tested path. Anyway you could try and see what happen.
Please, read this:
We warned about it.
PLEASE TAKE NOTE
Within the next few days we will be merging our bleeding-edge development into vangelis (testing) branch. This will make vangelis a development branch that should not be used for production. (Not that you should have been anyway!)
Please move to oram to continue to experience a (relatively) stable workflow. Vangelis may be broken at any point (hopefully for not too long!) and should only be used to test the latest bleeding-edge developments. We strongly recommend using a dedicated device (or boot media) for vangelis, separate to your normal, day-to-day zynthian usage (which should use oram).
There are many changes in this development version and full forward / backward compatibility is not guaranteed. Indeed, you are unlikely to be able to move between oram and vangelis without a degree of hurt.
Please heed this warning! Move from vangelis to oram and / or do not update vangelis unless you want to feel the same hurt that we developers experience.
Regards