[lilikopter]

I have upgrade my firmware 3.5.35 to an other firmware and the result are my mp4 are dead. So when I try to turn on my original firmware the computer dosen't reconize my mp4 and I can't formated the dics because the mp4 are locked. I have use the S1FWX and he reconize my mp4 but he can't open the firmware because the write-lock is activated. I have try to use mp3 player upgrande tool and the message are same too! Somebody can help me? how I can unlock my mp4 for switch firmware? THANKS!