Nokia's current-generation of Windows Phone 8 devices have all been given tasty performance and stability updates.
The new download fixes WP8-related auto-brightness issues, which should make for a less drastic brightness shift like the one you see in the Lumia 920.
Not that Windows Phone 8 wasn't snappy enough on the likes of the 920 and its younger brothers, but Nokia promises the download should speed up the phones as well.
For those who want specifics, the 920 and 820 update is called 1232.5957.1308.00xx. The Lumia 620's update - still to be made available - is called the 1030.6407.1308.00xx, and promises improved touch behaviour and fixes to camera performance, including exposure and flash.
Nokia says it is delivering the updates as we speak and has posted a handy support page which will help you download them.