Thanks for detailed reply, Stewart. Yes I rebooted ALL routers. No, never saw Rachio xxx network in any of my
devices, either iPhone or iPad or pc! As I mentioned, the yellow light keeps blinking the whole time while it tried (and failed) to join the Wi-Fi network… till the error message. … and still blinking… I dare not to “factory reset” my Rachio because I’m not that techi-Savy and really afraid of losing whatever account setting it already has. Lol.
Last but not least, I sure use iPhone 11 and of course updated iOS …now already 14.0.1, same as my iPad. Could it still b because of iOS issue for Rachio? And no, sorry I don’t have old iPhone/iPad around. …
Btw, without Wi-Fi connection, can I set up watering schedule manually on Rachio 3? I CAN water various zones manually but didn’t see anywhere to set/change schedule directly on Rachio 3… In other words, if it’s offline, it will only run what the app last set it up. … ( In my case I happened to have just paused the schedule a few days ago 
… since Rachio didn’t skip the watering when it rained. )
Just getting more and more depressing! 
