Texas Bandit

Okay so I am a noob when it comes to touchscreen stereos. I just recently bought a F90BT and I had a few questions about it. 1. How do you get the music to play on this unit viva SD card or USB storage device? I can't seem to figure it out. 2. Is there a way to where the background can be changed when it's not in navigation mode? Maybe a hack mod that can be easily put on it? 3. Is it capable of being hooked up to a Pioneer CD changer? I'm a 90's-00's kid and I like being able to still use a CD changer. Like I say I'm a noob on this touchscreen stereos and I'm learning as I go. I

I got a AVIC-F90BT with the custom splash screen option, and would like to have it changed to something that involves the state of Texas. Think you can come up with a few ideas?