Bought this truck last fall and it came with the pictured head unit which I have deduced as a sort of generic upgrade. CD slot just gathers dust and all my tunes are on a micro SD. The only button available for this is the second in from the right which brings up the folders menu. The card is 32gigs with about a quarter space left. When I scroll the menu folders it stops at the Js. The rest is not available. I have removed the card and checked it and it's all there. I haven't replaced this because it works fine, is powerful and suits my needs. There seems to be no other settings to access my tunes. Is this limited access because it is caching the tunes and that's all it will hold or am I missing something? If I can't access all my music on a long trip then I will go for an upgrade but don't really want to. Info on this unit seems to be very limited.