New Kenwood Double Din not playing .mp4s

I recently swapped out my old Kenwood DDx5180 and got a Kenwood ddx7015 (European model). It's not the newest kenwood I just need Garmin maps... but since I made the swap, I'm unable to play my .mp4s off my usb thumb drive anymore. The files are saying "not supported". I've converted the mp4s to .avi's and some of them play but most of them don't. Does anyone know of a work around?

Also, I know this DDX7015 has air mirroring. What do I need to get started? A HDMI Dongle and a USB to HDMI Adapter? I have a Android, do I need to install a app or some sort?

Any help would be appreciated. Thanks!

 

Make sure your drive is formatted in FAT32. If that doesn't work pick 5 random (unplayable) files and convert them to WMV.