Hey Don,
I see you are on Metro PCS which tells me you most likely have the T-Mo variant of the F6 and not the Euro one.
T-Mo states 4.1.2 (Jelly Bean) is the highest version of Android for your device. There was only ever one update, a minor security fix and interface tweak. That would bring you to software (firmware) version D500v10h and that is since 9th December, 2013...