Windows Phone 7 Mango update has been released to manufacturing and now it is just a matter of waiting until the update is released to the public.
However if you are willing to put your phone through an unauthorized update, the folks at XDA Developers may be your solution. They have gotten their hands on the official Mango RTM (7720) build and they have posted a method to get this update on your devices.
Please note that the process of flashing a device can cause your device to be un-usable. You are doing this at your own risk, and the posters will not be responsible for the damages
- Instructions translated from German can be found here.
- Files required for flashing can be found here and here.
- Original thread at XDA is available here (read first)
- Simpler thread can be found here.
Discuss your experiences in the comments section below
source - WPCentral