This unit has been buggy for a little while. So could not get the unit to get beyond the SANDISK start up screen. So I went to load the firmware files by holding the RECORD key and getting to default to the USB setting. Then I copy the firmware files over. They are BL_SD_boardSupportSD.rom and PP5022.mi4. Then I disconnect the unit and looks like it reloading. However it come back to the SAN DISK screen and will not go beyond that. Please help.