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Considering Windows 10 is a package across all devices these days, a Windows 10 Mobile only update is rare. At the very least Windows 10 PC leads the way. However, Microsoft has today rolled out Windows 10 Mobile preview build 14977 to the Windows Insider Program Fast Ring.

The Universal Windows Platform (UWP) means that Windows 10 updates are rolled out to PC. They later come to other devices like mobile and Xbox later. So, where is the PC build for this preview? Well, Microsoft explains a bug is preventing it from rolling out a new update for PCs this week.

“We will not be releasing a PC build this week due to a blocking bug that could result in broken apps after updating to a new build,” the company says.

There are not a lot of new features for Insiders on Windows 10 Mobile. However, build 14977 does introduce EPUB support that was initially rolled out to PCs with Windows 10 preview build 14971 last month.

EPUB support in Microsoft Edge is now available on Windows 10, at least for Insiders. At its basic level, this lets users read any unprotected e-book file in the EPUB file format.

As mentioned, this release is not high on features. It does have numerous fixes and improvements, which you can see below:

  • We’ve changed the rendering technology used for many types of UWP app content, so please provide feedback through the Feedback Hub if you notice any new visual glitches in UWP apps.
  • Alarms sent by 3rd party alarm apps will now break through Cortana’s Quiet Hours – we appreciate all the app developers who logged feedback requesting this, keep it coming!
  • We’ve removed the top-level option in Notification Settings to disable alarms on the lock screen – alarm reliability is a top priority for us, and we’ve found this setting was frequently enabled accidentally, without awareness that it would stop alarms from waking the phone when the phone was locked. For those who still wish to enable this setting, it’s will continue to be available under the per-app notification settings.
  • Notifications from Settings can now be customized or disabled – option is available under Settings > System > Notifications > Settings
  • We have enabled OAuth support for Yahoo Mail accounts. This will improve sync reliability for those accounts, and provide a secure experience while browsing your email.
  • We fixed an issue where disconnecting and reconnecting a wired headset while watching a video might result the audio no longer working.
  • We fixed an issue Insiders may have experienced where certain music apps would unexpectedly stop playing music after a single song.
  • We fixed an issue where closing a tab in Microsoft Edge, exiting the app, and then relaunching it would sometimes result in Edge opening to a blank page with the closed tab’s web address in the URL bar.
  • We fixed an issue where the Start Settings page wasn’t rendering when opened on external screen while using Continuum.
  • We’ve made a number of translation improvements, including, for French (France and Canada) speakers, fixing a grammatical error in the “Don’t Forget!” text seen when shutting down the phone so it now says “N’oubliez pas”, and for Chinese speakers, fixing an issue where the option to clear the Chinese Input Method Editor’s input history was displaying in English rather than Chinese. If you see any other translations that aren’t as you’d expect, please log feedback – we’re listening!
  • We fixed an issue where, if the setting to show notifications above lock had been turned off, booting the device and immediately checking the Action Center while the phone was locked could result in the Action Center not displaying any notifications after the phone had been unlocked.
  • We fixed an issue Insiders may have experienced where the Camera app might not appear after using the hardware camera button while the screen was off or while on the Glance screen.
  • We fixed an issue where Bangla (Bangladesh) keyboard text prediction might stop working after entering character followed by a vowel mark.

Windows 10 Mobile Preview Build 19477 Known Issues

  • Please avoid attempting to install new languages, keyboards, and speech packs on your phone. There is a chance these downloads may get stuck and not finish downloading. If you have existing languages, keyboards, and speech packs installed – they will carry over when you update to new builds. You can use Windows Device Recovery Tool to go back to Windows Phone 8.1 or Windows 10 Mobile, install any languages, keyboards, and speech packs you need and then update to the latest build in the Fast ring as a workaround.
  • Windows 10 phones with 8GB of internal storage such as the Lumia 550 and 650 will likely receive an 0x800700b7 error when attempting to update to this build.
  • System related notification toasts (e.g. Bluetooth, USB/Autoplay, etc.) do not work.