Microsoft are rolling out a new Windows 10 Mobile build for Windows Insiders on the fast ring. Build 10581 fixes the upgrade bug of the last two updates so you can be running a previous build of Windows 10 Mobile and still get the upgrade.

There don’t seem to be a whole lot of changes in this release. They have “Hey Cortana” working again for upgraded phones, sharing photos through 3rd party apps like Facebook now works, there should be better battery life and other fixes (see below).

As with ever there a few minor issues in the build including the screen going black during the upgrade (it is still working in the background). You can read the full details on Microsoft’s blog post.

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.

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