Sp1web

I got 97 960 the radio is fr - 816 when I bought the car it was off the code is written on the top I called the dealer to verify it is the code I did the 2-hour thing it came out and said code I put in that code didn't give me an error code it it just stayed at the code I put it in and it didn't do anything else I just said the code that I put in nothing else I tried all the other buttons power on power off any ways to fix this I would definitely appreciate thanks