Windows 10 Mobile build 10581

Windows 10 Mobile build 10581 is a build of Windows 10 Mobile. It was released to Windows Insiders in Fast Ring on 29 October 2015.

This build mostly includes small improvements and bug fixes.

Improvements and bug fixes

 * In Lumia Icon, Lumia 1520 and Lumia 930; the "Hey Cortana" feature works again.
 * The user can now select photos for sharing to third party apps such as Facebook Messenger, Facebook, Instagram Beta, WhatsApp etc.
 * Improved battery life.
 * Fixed an issue where some apps cannot be chosen for quick actions on the Lock Screen.
 * Improvements to auto-correction and text prediction.
 * Improved video recording functionality.
 * Visual Voicemail syncing now works again.
 * Dual-SIM issues that appeared in build 10572 have been fixed.
 * Fixed an issue that stopped Chinese Pinyin QWERTY working. This bug also appears in build 10572.

Issues and bugs

 * Devices may experience black screen for 5 minutes between spinning gears and final stages of the update. The exact time depends on the device.
 * User is unable to set default save locations via Settings > System > Storage and it doesn't reflect the current storage configuration.
 * Deploying Silverlight apps from Visual Studio to user's phone doesn't work in this build.
 * If user restores a backup from another phone, the Start screen may be corrupted. Only workaround is to set a different background in Settings > Personalization > Start.

SD Card Problems

 * If there's an SD card in the user's phone, it will show a garbled name in Settings > System > Storage page.
 * Moving apps to SD card may result in apps crashing. Only workaround is to reboot the phone.