Well, I’m missing something here. I went to the “Using the SD card for UI assets” page, then downloaded the UI_old.zip and opened it in the uSD card, moved the uSD to the OS slot.
Next instruction is “Navigate to the following URL, replacing os_addr with the OpenSprinkler IP address: http://os_addr/su”. The graphic shows URL 10.0.3.8/su, but trying to open that in a browser gets nothing. The “http://os_addr/su” also gets nothing. Opening the device address on my home network just gets the OS user interface; but there is no option there to change the Javascript URL (or if there is, I haven’t found it).
I’m running S/W version 2.0, if that matters. Thanks for any advice.