i,v just upgraded my mp4-659 with other firmware versions of MP4 (MP4-669).. after the upgrade process.. my MP4 hang up and it turned on automaticallly. i thought that it is normal. but when i turn it off and turn it on again.. my Mp4 doesnt open anymore. what should i do? pls help me... pls email me at maxrpm_1000@yahoo.com for solutions. thank you...