Announcing Windows 10 Mobile Insider Preview Build 10581

Hi everyone,

Today we are rolling out Windows 10 Mobile Insider Preview Build 10581 to Windows Insiders on the Fast ring. We’ve fixed the bug preventing upgrades from earlier builds. So if you stayed on Build 10536 or if you flashed back to Windows Phone 8.1 and then installed 10549 or 10572 you can upgrade directly to this new build without going back to 8.1 again. This build doesn’t have significant new features but does include a bunch of good fixes and general performance improvements.

Here are some things we have fixed:

Known issues:

We’re very happy to have the upgrade bug behind us which caused a few unusual flights, and are hugely appreciative of the Windows Insiders who did the extra work to re-flash and try those builds. For those of you who chose to wait it out, we hope you’ll find this build worth the wait.