Now, that 1308 firmware has been spotted by us on the Navifirm system for the AT&T Lumia 920, meaning the release should be within a few weeks, at most, pending a nod from the carrier. Peeking on Nokia’s servers, we can see firmware for “RM-820 NDT America ATT” with the five color options available (white, black, red, cyan, and yellow). The firmware is marked as 1232.5957.1308.1.
Updated firmware for the AT&T Lumia 820 though is still evidently pending approval, as that is not visible on Navifirm for AT&T just yet. For Lumia 920 users on other carriers, the firmware has been spotted already for Rogers, Antel, Telenor Mobile, Turkcell, Orange, Proximus and many, many others. That means their updates should not be far away either.
Should users wish to download this firmware now, they can but should be aware that you will wipe the phone of all data in order to update it with this method. That means you need to backup all of your photos, notes, messages, etc. and that you will lose game saves.
As an alternative, we strongly recommend that you just wait a few days for the OTA update, which will be a lot easier.