6 cd changer keep giving error message

I have a 2005 honda accord with a honda 6 cd changer. After replacing the battery, the 6 cd changer fail to eject or play the music. When you try to play the cd, it keep giving error message.

Disconnect the battery, wait 30 seconds, then reconnect the battery. When you reconnect it don’t be slow or hesitant. You want to get power to the changer without any interruption. It should reset.

We did disconnect the battery, waited, and re-connect the battery, press button 1 and button 6, to get reset code, but the code did not come out; but the radio and CD changer in the radio played the same, but the 6 cd changer still give the error message.