Android app does not recognize my network

It asks for the SSID I changed it to one word no special characters and connection still failed. A network search would be helpful. I even changed my password and that didn’t work ether. I tried the firmware update but that looks like I need internet to make that work so im stuck.

Is your wifi 2.4 GHz? 5 GHz won’t work.

2.4 ghz can the password contain special characters!@#$%?