I guess the obvious answer of "take it to the dealer for warranty service" doesn't help. What area are you from? What year / model Challenger? Any symptoms other than "dead"? Is the whole screen black, radio part doesn't work, can you control other car functions with the unit?
Thanks
I live in San Diego. Car is 2015 Challenger R/T. I installed a 2015 Ram RA4 radio in it 5 months ago and had the dealer flash it. All was golden until recently. Radio will no longer power up at all. Screen is black. No warranty.
Update: Fortunately I took it to the dealer before sending it off. Good thing I did. Apparently when the dealer flashed it 5 months back, he didn't lock the plug on the back properly so it was going on and off. They came back to me in the waiting area and told me the plug wasn't put back the right way. I said "Guess who worked on it last". They said it's fixed and no charge. Music to my ears! Works perfect!