Hello, did you have a look at the NAS2000 wiki? http://www.nas-2000.org/mwiki/index.php?title=Bootloader_-_program_Flash_thr ough_JTAG There you find what is needed for NAS2000. For DUAL-NAS I think it will be similar, but the CPU is different and therefore I think it will not work. You could give it a try. If you could get a datasheet of the CPU I could verify if there is a chance. Do you have experience in hardware? I mean soldering, building some small circuits, doing simple measurements... HWguru.