Be careful
Files here: http://avic411.com/index.php?/topic/83505-new-release-f20bt-f30bt-f40bt-f920bt-f930bt-f840bt-etc-2017-release/?p=345456
are corrupted and cause stop the actualization at 93%. This is T1000-25815 for AVIC F20BT-F920BT- etc.
Do not try to actualize with godzilla files at the beguining if your model is not suitable for T1000-25817.
I did actualize my F920BT with T1000-25817, which was accepted and finished without error, but it caused GPS not to work. Everything was fine except GPS, that showed good signal on settings, but maps where not working. Also the syste