While there has been massive fanfare and hooplah for Microsoft’s latest mobile operating system, not much is known about the arrival of the promised Windows Phone 7.8 update for older devices. Thankfully, the new update has shown up ahead of schedule via Navifirm. Although it’s still not an official launch for the update, users who have taken the plunge and downloaded the update report that it is legit, and works for a number of Nokia devices which include the Lumia 510, 800, and 900. If you’re feeling adventurous, you can use Navifirm to download the new update (if it hasn’t been pulled yet) – just remember to backup your data first so that you’re covered if something bad happens.
Source: My Nokia Blog