Microsoft is releasing Windows 10 Mobile Insider Preview Build 10586 to Windows Insiders in the Fast ring. The build brings a number of bug fixes and improvements to the Preview. In the official post, Gabe Aul, Corporate Vice President, Engineering Systems Team, says, “Overall this is a really great build, and we’re excited to get it out there for all of you to try.” They also added an important note for any users who installed Build 10581 and later, to reset their phones.
According to the official post, the new build fixes the problem of the Start experience becoming corrupted after upgrading and restoring a backup from another phone with a different resolution. It also lets users to set their default save locations, and will correctly reflect the current storage settings. Additionally, the SD card should no longer show up as a garbled name in Storage settings. Moving apps to SD card should not cause those apps to crash anymore. Furthermore, the Messaging+Skype app has been improved, and so has its server. The resuming/loading text when switching between apps has been reduced in the new build, and the physical camera button should be working again, if it wasn’t working earlier. Apps and games should download more reliably, as well.
The post also talks about some known issues with the build, as well as an important notice for those running Build 10581. Users who did a factory reset of the phone after installing Build 10581 will find that the phone will go into a reboot loop after upgrading to Build 10586. This is due to a bug in the previous build, that caused the file system to become partially corrupted after factory reset. Those who have upgraded to the new build and are facing the reboot loop will have to use the hardware key combination to reset their phone. It is recommended that users backup their phone before upgrading to Build 10586. They can also use the Windows Device Recovery Tool to go back to Windows Phone 8.1, and then upgrade to Build 10586.
Furthermore, starting Silverlight apps though Visual Studio will still not work with this build. Although it said that the issue will be fixed on November 1 with the release of Visual Studio 2015 Update 1, users can deploy Universal Windows Platform (UWP) apps to their phone without any problems. The new build also has an issue where the tile for Insider Hub remains under All Apps, but doesn’t open. Users are advised to use Insider Hub on the PC as a workaround, till the issue is fixed.