I have had my unit installed since 2013 and working with no problems but had a flat battery and now when I select CHR on the stereo the display does nothing. My iPhone sees the Grom unit and I have successfully unpaired and repaired it but still no joy. I also updated the firmware but still no change. The Stereo unit is Kenwood GX-210KE. I am wondering if anybody else has experienced something like this and found a remedy. The radio & CD selection works fine. Would there be a fuse somewhere that may be stopping the stereo from recognising the GROM unit? Appreciate any ideas?