I have the old boss SoundLink air wifi speaker, which can't connect to my wifi. When I open the application and try to find my wifi, I don't see my wifi network but I can see others. I don't know why I can't see my wifi signal in the application but in the past, I can see it and set up the speaker normally. Maybe I have to set up in 192.168.1.1 but I don't know how to do that collectively.
Sorry to hear about the difficulties you've been having. To put the system into alternate setup mode, you can press and hold the 'reset' button on the bottom for approx. five seconds, until you hear a beep from the system.