Windows 10 Technical Preview build 10052 for phones released (and Lumia 520 is supported!)
Microsoft has announced a new Windows 10 Technical Preview version build 10052 and some bug fixes as well as a workaround for the bricked Lumia 520. here. The update is available to users on the “Insider fast” ring only.
Once the update is done the bug fixes mentioned are the following:
soon more details!