I had my Lumia 920 on the latest Developer's Preview firmware. I just used the Windows Phone Recovery Tool to reset the device, which completed successfully, but now I'm not sure if I'm still on Developer's Preview firmware or back to official AT&T firmware. How can I tell?
firmware revision 3051.50009.1425.2001
os version 8.10.12393.890
firmware revision 3051.50009.1425.2001
os version 8.10.12393.890