From To Instructions
1.0.0 1.0.0 Wait for Atmosphère, or see below for updating to 3.0.0.
2.0.0 2.3.0 Update to version 3.0.0. See How to update to 3.0.0.
3.0.0 3.0.0 You can run homebrew. See nx-hbl.
3.0.1 {latest} Feel free to update to latest version if not already. Wait for Atmosphère.

Once ready, Atmosphère will be usable on all system versions, for all Switch systems with the original hardware revision (via bootromhax).