Default [Q] Lumia 521 Update?

So I read that the Lumia Black update is out now and other 520/521 based phones have it, at least on ATT. Is there anyway to download the update and manually flash it to the phone? If they are not releasing this update for our phones, I fear they will never release the 8.1 update either when it comes out Also does anyone else have issues transfering files from their pc to their phone? It takes an extremely long time, slow phone write speed I assume, and half the time it times out altogether. I am running Windows 8.1 and have a good computer so I know its not on that end.
Direct link to my gallery of native Touchpad resolution wallpapers: Here
Link to relevant Reddit post about my gallery with instructions on how to set them without any crop or blur: Here