I really new to this area. I've got complete files of Mfgtools with it's Ubuntu Trusty image (trusty.tgz). I run the mfgtools with serial download mode to install the ubuntu to eMMC, and it works fine. But after I restart the board (boot from eMMC), it's give me only blank screen (trough HDMI). Do you know why? Should I extract the trusty.tgz file under "Mfgtools-HOBBITQ-Ubuntu-1.0\Profiles\MX6Q Linux Update\OS Firmware\files"?