Fast ring上了10586.71
簡單說就是這種bug修復，看起來耗電問題也有修復
* Windows Update performance and reliability improvements
* Improvements in migration of data profiles and messaging settings when
upgraded from Windows Phone 8.1.
* SensorCore API’s are now upgraded correctly from Windows Phone 8.1; allowing
applications, including many fitness applications, to correctly access
movement data.
* SD card detection has been improved on boot and after insertion; File
* Explorer now handles the removal of an SD card when the default for apps or
photos are set to SD.
* Improvements in the Edge browser, including PDF rendering.
* Bluetooth improvements when re-connecting to already paired devices and cars;
turn by turn directions, and when using Cortana with the Microsoft Band.
* Improvements in Settings when downloading Maps or changing Quick Settings.
* Reinstalling Groove Music from the Windows Store no longer causes DRM music
playback issues. Groove Music local song collections are now more quickly
imported within the application
* Device power improvements after listening to music, after missed phone calls
when iris detection is disabled, and when downloading updates.
* In app purchases now work correctly when cellular data is disabled.
* Improvements to the reliability of Kids Corner.
Lumia 920經初步測試熱點好像沒問題了!!...