Windows 10 Mobile Preview Build 10581 Available Now

Microsoft today rolled out Windows 10 Mobile Build 10581 for Insiders in the fast ring. It has not significant changes but has major bugs fixes.

Microsoft today rolled out Windows 10 Mobile Build 10581 for Insiders in the fast ring. It doesn’t include significant changes but includes some bug fixes that prevented Insiders from upgrading from earlier builds.

For the last two – build 10572 and build 10549 you had to roll back your phone to Windows Phone 8.1 before getting the new build. So, if you stayed on the previously working build (10536) before the bugs came up, you can now upgrade directly to build 10581 without rolling your phone back.

Windows Mobile Preview Build 10581

Here’s a look at what’s been fixed according to Microsoft exec Gabe Aul:

  • For devices upgraded from Windows Phone 8.1 like the Lumia 930, Lumia Icon, and Lumia 1520 that had the “Hey Cortana” feature – with this build “Hey Cortana” should work again in Windows 10. To make sure it’s turned on, just go to Settings > Extras > Hey Cortana.
  • You can now select photos for sharing through third party apps like Facebook, Facebook Messenger, Instagram Beta, WhatsApp etc.
  • Battery life should be improved in this build. We fixed several bugs impacting battery life.
  • We fixed an issue where you couldn’t choose some apps to show quick status on the Lock screen via Settings > Personalization > Lock screen.
  • We’ve made improvements to text prediction and auto-correction.
  • Video recording functionality has been improved.
  • Visual Voicemail sync should now work properly.
  • We fixed the dual-SIM issues that appeared in Build 10572.
  • We fixed the issue found with Build 10572 where the Chinese Pinyin QWERTY keyboard stopped working after upgrading from Windows Phone 8.1 that our Chinese Windows Insiders reported.

And of course, there are known issues which include the following:

  • As with previous builds, after applying this update the device may appear at a black screen for about 5 minutes when transition between the spinning gears and the final stages of update. Just be patient and it should progress past it. Exact time will vary by device.
  • You will be unable to set your default save locations via Settings > System > Storage and will not correctly reflect the current storage settings. If you are using a SD card in your phone, it will show up as a garbled name in Storage settings. Whatever you had configured for your save locations in the previous build will be the same.
  • After moving some apps to a SD card, those apps might crash. The workaround is to reboot your phone and those apps should work fine thereafter.
  • Deploying Silverlight apps through Visual Studio to your phone won’t work in this build. You can deploy UWP apps to your phone without any issues.
  • If you restore a backup from a phone that had a different resolution, you may end up with a corrupted Start experience. The workaround is to go to Action Center (which won’t be corrupted) then Settings > Personalization > Start and apply a different background picture.

The good thing about this new build is that if you stayed on Build 10536, you can now enjoy the new features that were added since the last solid update.

If you’re an Insider and testing out Windows 10 Mobile on a Windows Phone, let us know how your update goes and what you think of the new features in the comments below.



  1. Brian Burgess

    October 29, 2015 at 5:05 pm

    On my Lumia 635 the update progress has been stuck at 12% for the past 2 hours. This always happens with my Win10 Mobile updates…sigh.

    I’m just going to let it run over night. That’s usually what I do and it’s all done the next day.

  2. AJ Vasaris

    October 30, 2015 at 7:34 am

    I went to bed when the gears started turning and woke up to a new build! Cleared up a lot of quirks from 10549 and loving the slower battery drain on my Lumia735.

    • Brian Burgess

      October 30, 2015 at 3:42 pm

      lol, yeah on my Lumia 635 it took several hours to download and install, but so far so good — well as good as a preview version can be…

  3. Ron Mac

    October 30, 2015 at 2:42 pm

    Build 10581 (so far) has been stable, fast and worthy of being a daily driver. Before the Denim update on 8, I was hating WP. After Denim I started liking WP and with WP10 version 10581, I really love WP. I have no desire to go back to iPhone.

  4. adam

    November 18, 2015 at 1:00 pm

    I’ve been using windows 10 as a daily driver since 72. I actually had to check if I had the correct build because it updated so seamlessly. I noticed a few new icon changes, that’s what triggered me to look. (Lumia 1020) lots of tiny bugs have been changed to calendar, the drop down menus, Ext. In my case, it’s safe to say i have a daily, fully functioning, windows 10.

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