Microsoft Releases Windows 10 Mobile 14977 with Possible Installation Errors – No Build for PC

Rafia Shaikh
Windows 10 Mobile

Microsoft has released a new update to Windows 10 Mobile Insiders on the Fast ring. It's been a couple of weeks since the company released any preview build. PC Insiders won't be getting any new build this week, as the software maker said there is a "blocking bug that could result in broken apps after updating to a new build."

While PC users will have to wait longer, finally there is something for Windows 10 Mobile Insiders to be happy about. The new Windows 10 Mobile Preview build 14977 brings support for EPUB books in Microsoft Edge, along with the ability for third-party Alarm apps to break-through Quiet Hours. The rumored Reset App hasn't made the cut in today's release. Following are more details of today's Preview build.

Windows 10 Mobile Insider Preview Build 14977

Read EPUB books in Microsoft Edge on your phone: In addition to being able to read any unprotected e-book in the EPUB file format on your PC with Microsoft Edge – you can also read unprotected e-book in the EPUB file format with Microsoft Edge on your phone! When you open an unprotected e-book in Microsoft Edge, you will be taken into a customizable reading experience where you can change the font and text size and choose between 3 themes: light, sepia, and dark. As you read, you can leave bookmarks. To navigate through an e-book, you can use the table of contents or seek bar at the bottom of the browser. And you can also search for words or phrases and use Cortana to define specific words.

You can download and read unprotected e-books from places like Feedbooks, Project Gutenberg, Free eBooks (requires sign-up), ePubBooks (requires sign-up), Open Library and even our own Microsoft Press. Try out reading an e-book in Microsoft Edge on your phone and let us know what you think!

Known issues with Windows 10 Mobile Preview 14977

There are a few known issues with today's build, including a possible installation error 0x800700b7 for Lumia 550. Here are the details (emphasis is ours).

  • 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 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.

For more details about the bugs fixed and regular improvements, please visit the official announcement page.

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