Microsoft is now rolling Windows 10 build 15051 for mobile devices enrolled in the Fast ring. The new release for phones is a minor update with no new features, but it brings a number of improvements and bugs fixes to the operating system.
Windows 10 Mobile build 15051, according to the company, fixes frequent reboots for users running build 15047. It also addresses problems with certain apps, such as Calculator, Outlook Mail, Outlook Calendar, Groove Music, no appearing after a hard reset, and other apps crashing.
Cortana gets improves reading text aloud over Bluetooth, and Microsoft is also fixing an issue after upgrading that unexpectedly shows the full QWERTY keyboard on the lock screen instead of the pin pad.
Windows 10 Mobile build 15051 includes a few known issues, such as bug that causes background tasks to not run in the background like they should such as OneDrive camera roll sync feature.
If your device experiences an unexpected reboot, in some cases you may lose your call, text, and email history may be lost. And Microsoft Edge may constantly reload web pages.
There is not Windows 10 build 15051 for PCs, but the company recently made available build 15048 to the Slow ring for PCs.
Microsoft is listing the complete set of fixes and known issues for build 15048 at the Windows Blog.
You can also use the following resources:
Windows 10 Mobile build 15051 is available immediately through the Fast ring. It’ll download and install automatically on your device, but you can always force the update from Settings > Update & security > Windows Update and clicking the Check for updates button.
Update, March 10, 2017: Microsoft is making Windows 10 Mobile build 15051 available in the Slow ring for Insiders.