I have a 2011 Versa H/B SL with Nav package. I see there is a USB port and I know whats its for, but I am wondering if its IPod only or am I able to plug in a Flash drive with music? I heard something about some sort of a 'firmware' update at one point, then i heard about it depends on the size of the flash drive and format. Has anyone had any luck with this? Thanks so much! 