meanwhile, thanks to the answers, I entered the mac address but the find.synology.com site and the program do not detect it, I tried to keep that of the original file and it recognizes the nas but it does not recognize sata ports and to disconnect and reconnect the hdd .. I tried but the problem persists, so it does not let me install the dsm. I some time needle I managed to install xpenology but I don't remember the version, I had simply flashed the OS and it worked ..