Found code but will not accept it, what now??

Where did you get the code from? If it doesnt work you might have to disconnect the battery for a few days then that should reboot the system.

You should call or disscuss with honda dealer to check the radio's serial number for you. If you're lucky, they may do it for free or else what this video

https://www.youtube.com/watch?v=hGlEIArG05s