How do I downgrade Windows Phone 10 Lumia 1520?

[Windows Central Question]

How downgrade Windows Phone 10 Lumia 1520

My L1520 has 10.0.10586.63 OS build, but I would like to use Project Astoria on my phone. How to downgrade my OS build to the version I could use Project Astoria?

 

[PepperdotNet]

Re: How downgrade Windows Phone 10 Lumia 1520

Can't be done. You can roll it back to 8.1 with the WDRT, but the current builds available through Insider are newer than when Astoria was a thing.