I had this same problem of the firmwares not being recongnized even tho i had used them before... It kept saying invalid firmware... so i tried different versions of the tools mtv tools 3.13, amv tools 3.68, and 4.0... until one would let me flash it... this worked for me... good luck and make sure u check the board ID on your mp4 so that you dont flash an incorrect firm..
Good Luck.
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