Microsoft has released the Windows 10 Mobile Cumulative Update for May. The firmware update brings the software version to 10.0.10586.318. Here's the changelog from Microsoft. Reliability, performance and stability improvements.Fix for a problem that could result in unexpected battery drain while the phone screen is off. Improvements to the update system to prevent phones getting into a state where attempting to take an update may lead to errors 0x800f081f or 0x80070570. Fix for a problem that caused some phones to finish the initial setup wizard with an incomplete set of app...
Source: http://www.gsmarena.com/windows_10_mobile_cumulative_update_for_may_is_out-news-18179.php