Microsoft released Build 10052 of Windows 10 for phones on Tuesday, along with a revised rollback tool that should help solve the bricking problems that Lumia 520 users and other unlucky souls experienced. The major problem that the new build solves is an issue where some users—including owners of the most popular Windows phone, the Lumia 520—suffered catastrophic failures that “bricked” the phones when they tried to roll them back to Windows 8.1. Microsoft said it has solved the bug on Lumia 520 phones, with an update to the Windows Phone Reset Tool.