For those who are interested in downloading and customizing firmware for Lumia 920, RM-820 the firmware version for AT&T and Lumia 920 is now available at NaviFirm. Not only this, the listing for Rogers version reveals Yellow Lumia 920 coming to Rogers soon other than the only available Black model currently. Also, since the Rogers version of off-contract Lumia 920 is truly unlocked hence many developers will be looking at the Rogers Firmware with interest :).
