The link is not broken. Try to use a private browsing window or clear your browse cache. It may be that your browser has cached an old and outdated link.
The guide links to http://raysfiles.com/os_compiled_firmware/v2.3/, which redirects to https://opensprinkler.com/os_compiled_firmware/v2.3/, which leads to page that shows “Oops! That page can’t be found. Tested with curl, so there’s no browser caching involved.
The firmware update instructions say specifically to save a copy of your configurations so you can import them after the firmware upgrade, to restore settings.
Indeed. But if the update wipes the IP configuration, how am I supposed to connect to the controller post-update to restore the configuration?
I’m not sure about static content from your reverse proxy. You need to provide more details.
The web app normally pulls a bunch of static content from https://ui.opensprinkler.com/js, but I’ve got mine set to pull it from a local server (by setting the “Script URL” at http://<OS hostname>/su. I assume that I would at a minimum need to update the content on my local server, but (again) I can’t find any documentation of how to do so.