many FFs + file-AFCCAA0E-E825-441E-A353-157F1E9D8289.free-00.fd at end (total file size == size of flash chip)
You have flash chip --> read marking --> size of flash chip --> create file (size of file == size of flash chip - size of file-AFCCAA0E-E825-441E-A353-157F1E9D8289.free-00.fd), which contains 0xFF (by means of WinHex, for example).
copy /b filename__FF + file-AFCCAA0E-E825-441E-A353-157F1E9D8289.free-00.fd filename_bin
filename_bin - binary image.