When first connecting to your home gateway, the M5GO software that comes with the M5Stack Fire does not work with special characters. For example if you enter a "#"in the password, the software sends it to the gateway as an ASCII string and the router does not accept it. I had to change the router WiFi password to all letters and numbers to setup the M5Stack Fire when it first arrived.
Andres Pineda 发布的帖子
M5Stack Fire will not pass special characters correctly on password when signing into WiFi for initial setup