needradiocodehelp

I can't believe I'm reaching out for help with this—I'm usually the go-to for directing people to the right website to get their codes. Here's the short version: I changed the battery and when I powered on my Audi Audio10 radio with RDS, it displayed the word "CODE." I found the code in the manual, tried inputting it, but the radio keeps showing "WAIT," indicating the code is wrong after three attempts. I went to the Audi dealer, got the same code, but it didn't work. I even removed the radio, noted its model and serial number, and used www.radiocodehelp.com, which gave me a different code. However, the radio only allows four digits to be input, and the new code starts with a 6, making it impossible to enter. I'm a bit stuck now because someone's coming to see the car later, and the radio isn't functioning. Any suggestions would be greatly appreciated.