Just now I wrote about the hoops I jumped through to get a fully working and fully updated Windows Phone, which is now running Nokia’s Cyan update and the Windows Phone 8.1.1 update. In short, there has been an issue with updating directly from Windows Phone 8.1 Developer Preview to Cyan, which is a Nokia specific update that includes the final bits of Windows Phone 8.1 but also some firmware updates, including Bluetooth 4 LE, so it’s worth making the upgrade to the “official” bits.
However, in order to revert your Developer Preview enabled phone, you have had to run Nokia’s Software Recovery Tool, which while it works well also wipes your phone, which is a bit painful even with the phone backed up. But, according to Simon Bisson, for one, that isn’t really necessary.
Today’s Windows Phone 8.1.1 bits apparently also unlocks the update servers, meaning that you can install Windows Phone 8.1.1 DP on top of Windows Phone 8.1 DP, and then (when and if it’s available from your carrier), to Cyan, all through Settings > Update My Phone (with the Developer Preview app installed, of course).
So the easiest way to get your phone fully updated, if you’re currently on the Windows Phone 8.1 Developer Preview, is to first update your phone to 8.1.1 DP, and then to Cyan. That way, you won’t need to run the Software Recovery Tool after all. Since I received the Cyan update (on ATT for the Nokia 925 in the US) last week, I went ahead with the Recovery Tool option with no problems, but could have saved a few steps if I’d waited.