I tried updating blue and me following all steps from the manual... display showed complete.. after that mileage is blinking, USB port isn't recognised, bluetooth not working, and buttons on steering wheel except the buttons for the volume... first option is to remove the battery for 30 minutes, but i don't know if the radio requires code... unfortunately i don't have the code, and the sticker with serial number is scratched.. i have one possible code but i want to be sure. What should I do? Thanks