I had a 2009 MDX that I bought previously owned from a Honda dealer. I had to change the battery but when the navigation booted up, it told me to enter a password. I tried to register my vehicle on the Acura site but it said I had a inaccurate VIN number. Now my navigation doesn't work and I talked to my dealer and they said they would fix it, but I have had no response from them since. Can anybody help me on how to fix this issue?