If u have your key which looking in previous posts u do, then follow the dosflash route, it works everytime
i found that if i loaded iprep onto a mem stick then added dosflash (latest version)
also add l-o-eras onto said mem stick
you will also need a copy of your lite_cfw.bin files added to the stick
now boot iprep but dont use it, Instead run l-o-eras (port no) mine being (ec09)
you should revcieve back ff80 just type it again and you should recieve ff72 if you get ff80 again then just turn the drive off and on again, now run l-o-eras again untill you recieve ff72
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im now taking it that u have ff72 so you should type dosflash
it will ask something about do u want to send mtk or somthing along them lines i hit (N)
it will now ask where is your drive mine is on 6 but yours may be different
it will give u some options to WRITE, ERASE, READ
as u have the key already.... TYPE LITEON E.... this will erase the drive once this is complete go back into dosflash again hit (N) then select where your drive is again mine was 6.
now u'll get the same message WRITE, READ , ERASE this time you want to wite your custom firmware.
you should go ahead and select W - Write
it will ask you what file name just type lite_cfw.bin, this will now write the custom firmwasre to ur drive, once finished you can restart ur pc put ur drive back in your xbox and play happy..........