Thank you both.
I just updated the firmware following the guide at https://opensprinkler.freshdesk.com/support/solutions/articles/5000631599-installing-and-updating-the-unified-firmware#upgrade
However, now it appears the app is not working. The pi is on the network and can see and be seen by other members of the network. However it is almost as if the “web server” on the pi is not working.
There were no errors in the building of opensprinkler. The were no errors with the pulldown from github. there were no errors when i restarted the service. Checking the status of the service returns that everything is running. But yet the app (the control webpage and the android app) always comes back as not found.