There are some dialer codes in Nokia 6, e.g: *#*#4636#*#*
,*#*#2486#*#*
, *#*#372733#*#*
. The last one starts an application named "FQC". In this app, there is a menu containing "Receiver test", "LED test", etc.
I think this is for factory testing, but after starting this test mode, did my device change to a test device? If yes, how can I stop and exit this test mode? Do I need to factory reset?