I found a way to get the Ambient Tool to connect my WS-2902 (no a,b,c,d.......) using an modern android phone android 8.1.0. I had been connected continuously for over 2 years, but had a new router installed, weather station no longer connected. I tried probably 10 times, would just close down. When I first tried using the tool, it said something like "unkown ssid". I turned off "mobile data", "roaming" and "enhanced 4g lte mode". I then went to reinstall ambient tool, device said no wifi connection, but my other devices (a chromebook, an ipad, and a windows machine) were fine connecting to web pages. WTF? So, I looked at wifi setting on android phone, and sure enough it said i was not connected to wifi. So, i found my router, put my password in, wa-la connected. REinstalled ambient tool, went through process, it now had the correct ssid instead of unknown, i put in the password, and wa-la, my weather station was connected again!! I had tried an ipad, a chromebook, nothing worked. Spent three hours until I stumbled upon how to do it. Please pass around!!!