Microsoft has begun to roll out a firmware update to the 5.7 inch Lumia 950 XL. The update comes with a new firmware version number of 01078.00027.15506.02005 and a hardware revision number of 184.108.40.206.
Microsoft has cared to state what can be found in the new firmware update:
Stability and performance improvements.
Improvements for SD memory card support.
Improvements for automatic display brightness settings.
Fix for a camera problem that was causing noisy images in low-light conditions for some users.
Fix for a 4K video problem that was causing stripes to show up while playing back recorded videos for some users.