GDR3 & Nokia Black for T-Mobile?

[Mr Lebowski]

This is not the Black update from what I understand otherwise preview would have received as well.

Developers preview is for Microsoft updates not Nokia updates, Black is Nokia's.

 

[montsa007]

I was on dev preview too (1020, AT&T locked, using as an ipod currently).
Just select the option to receive preview updates as 'Off', soft reset and check for updates, works very well for me