technicolor TC8717T 2.4ghz connection trouble. - Time Warner Internet

This question is about "technicolor TC8717T 2.4ghz connection trouble.", with Time Warner Cable internet and apps. Hello,

I cannot connect to the 2.4Ghz wifi connection on my technicolor TC8717T router. Each time it says "invalid password" but I've checked the password in the Admin tool and it's exact. I've changed the password several times and reset the modem several times. Always the same error. The 5Ghz works fine.

Any ideas?

technicolor TC8717T 2.4ghz connection trouble.?