sa stranice koju je baja dao:
Prerequisites:
Zune client (preferably up to date).
Preferably 50% battery (at least) remaining in your cell phone. You can check the exact battery percentage using the diagnostic menu.
Remember that even though the procedure is pretty easy, it will take a lot of time. So be ready to part with your phone for about an hour or so as more than one update will most probably be required to get Mango, and during most of the procedure the phone will stay in download mode.