Gdr2

I found out that it could be downloaded if you used Windows Insider for phone. My preview of Windows for Mobile 10051 did not work, but I had noticed an update before the preview so when I rolled back to Cyan and then Denim I once again went to Windows Insider and did an upgrade but stopped there. The only issue I experience is the warning that I need to scan my SD card. But I also had to do a lot of re-settings like the Glance Background, display time out and such. I will let the GDR 2 sit on my 820 until next stable phone preview.
 
I just rolled back my Lumia to WP 8.1.1, because GDR2 made it lose mobile data connectivity sometimes, some apps didn't open and some games lost their sound... I can't be sure that GDR2 is guilty for all these problems, but they were not present before and they are gone now with GDR1.