Rear speakers not working

Mr pee

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Hi guys when I had my appradio 2 installed over a year ago the rear speakers were not working got it sorted but cannot remember how, I have just updated
my firmware and now the rear speakers are not working again presumably it's gone back to factory setting with the new firmware, I have trawled searches on various forums and found one hear which says turn your sub to rear speakers in settings which did ring a bell from last time but it's greyed out, now on hear it's making reference to this but says to switch it off, I am not clear what this means it can't mean switch the unit off as you wouldn't have any access to the setting lol acan anyone shed any light on this problem?