Just wanted to update everybody.
I was on the DP and wanted Cyan so today I used the Nokia Software Recovery Tool to rollback my AT&T Lumia 1520 to WP8. To my surprise. The tool did not talk me back to WP8, but took me to WP8.1 with Cyan.
Then I was able to restore my backup and get back on the DP Update 1.
It was a pleasant surprise that I didn't have to go all the way back to WP8 then ping the update site to get the AT&T WP8.1+Cyan update.
I was on the DP and wanted Cyan so today I used the Nokia Software Recovery Tool to rollback my AT&T Lumia 1520 to WP8. To my surprise. The tool did not talk me back to WP8, but took me to WP8.1 with Cyan.
Then I was able to restore my backup and get back on the DP Update 1.
It was a pleasant surprise that I didn't have to go all the way back to WP8 then ping the update site to get the AT&T WP8.1+Cyan update.