MAC addresses are not derived from S/N. They are matched by Synology so only Synology knows what the match is. Currently all generated SN are invalidated by Synology.   You could use the S/N and the MAC addresses from your real Synology box and edit the grub.cfg file accordingly and then try running DSM. However this is something I have said many times. Doing so does not equate to your DSM install being legit. The terms and conditions laid out by Synology are clear. DSM is supposed to