There is also a slight possibility that the download is broken. So if you know the checksum of the specific firmware revision file (there were/are lists in the web) then check or download it once more and compare. I would also try once more: Code: flasher -f -F c:\main.bin --erase-user-data=secure -F c:\emmc.bin --erase-mmc=secure --no-preserve -c without much hope indeed.
flasher -f -F c:\main.bin --erase-user-data=secure -F c:\emmc.bin --erase-mmc=secure --no-preserve -c