2004 Deville, Silver, Gone, but not forgotten, 1972 Eldorado, 1974 eldorado, 1975 CDV
I have just updated the firmware on my gmos-06 now I get no sound from the speakers. it is a 2004 Deville with the Delco amp. The new firmware is supposed to work better with the Delco amp, but I've got no sound now. I plugged the stock stereo in to test it and everything worked fine. Anybody have any experience with this ? I tried calling metra tech support and got a message that there was no one currently available.