Upgrading, backing up, and restoring pfSense
You can usually upgrade pfSense from one version to another, although the means of upgrading may differ depending on what platform you are using. So long as the firmware is moving from an older version to a newer version, pfSense will work unless otherwise noted.
Before you make any changes, you should make an up-to-date backup. In the web GUI, you can back up the configuration by navigating to Diagnostics | Backup/Restore. In the Backup Configuration section of the page, set Backup Area to ALL. Then click on Download Configuration and save the file.
Before you upgrade pfSense, it is a good idea to have a plan on how to recover in case the upgrade goes wrong. There is always a chance that an upgrade will ...