I have an ARMStone A9 Quad board which NAND have been completly erased by accident after "nand erase" command issued in U-Boot command prompt. Trying to restore it following the i.MX6 NBoot Programming instructions, I got and error after sending the NBoot binary image with DcuTerm and selecting "f" to flash. The error I got is "Unknown file type can NOT write in Nandflash". Do I need a speccial NBoot file? Am I doing something wrong?