Used to help with repair and installation of B&O electronic equipment and the normal customer nightmare was having to pre program(me) the settings via the all singing and dancing remote control. To alleviate the terror, next to last comment to them was, ' read the manual cos we will be ringing in a couple of days to ask questions on it' and the final and best one was ' If you get into a muggers buddle, switch the set off, unplug it, count to twenty and replug in and switch on. It will have re set to manufacturers original settings. If you call us out to do this it will cost £70' Don't know what the charge would be now, I'm going back 20 years.
Regards Ian.