I have the same problem, it happened after upgrading the firmware. All I get is a white screen, mp3 player still works. If I load mp3 files into the player I can play them. Consumer app canīt find Rock USB Device, so I canīt reverse firmware.
It has a Rockchip 2608A -
http://cgi.ebay.co.uk/2-4-TFT-iMirro...QQcmdZViewItem
Any ideas??