Google NSS (Nemesis Service Suite)

1.Connect your N9 with the USB cable
2.Now open NSS, scan the new device (click the magnifying glass icon)
3.Choose “phone info" after that select "read"
4.You can now see what your phone product code is.
5.At this moment you must modify the power mode to "local"
6.Your handset will restart in local mode,
7. Tick the product code and write a new product code over there then click the "write" option .
8.Set power mode to normal once more and hit "read"

Done!