In the next few months, Nokia is expected to release a forthcoming firmware update for their Lumia line. That should be no secret as we?re also expecting an OS update called Windows Phone 8.1. Firmware helps make your phone?s hardware better, and it?s very specific to your device. The OS though is general. That?s why the Developer Preview Program only gives the OS update, but requires additional firmware updates later on to complete the experience.
OS updates and firmware are like Sith, there are always two.
Full story from the WPCentral blog...