@Yoh-Yamada You have got an Arduino Dock 2. There are a few obvious things: You have plugged an Omega2(+) into the socket of that dock in right direction and right position. Is your 5V power supply okay? Is your Omega2(+) able to boot successfully? What about the amber LED? After a successful boot you must find an Omega-**** WiFi AP among the WiFi networks on your smartphone (too). Default password is: 12345678 Can you connect to it? Connected. Launch your favorite web browser and type: Connect to the http://omega-****.local/ site with a smartphone is another story. Good luck.