After failing to convert a FLU using b75 , I tried to jtag it with self-built jtag cable and Skymax software . But I got stuck at attempt to write , after successfully erased it. The message " The parallel port could not be opened " kept popping up although the connection was shown " OK ". I gave up after many times of reset and reboot computer as well as receiver . The FLU display was completely blank . As I know , it should display clock after erase (?). I switched to work on another computer but same result . Please help and thanks for any advice.