Lumia 900 owners out there. It appears that Nokia has officially released the software update to resolve the handset's data connectivity issues -- a full three days early, in fact. Users may download the software through either Zune on the PC or Windows Phone 7 Connector on the Mac. For those who'd prefer to swap out their handset at an AT&T store, you have between now and April 21st to complete the exchange. Naturally, the limited-time offer remains in place for all those who purchase a Lumia 900 before April 21st to receive a $100 credit to their AT&T phone bill, courtesy of Nokia. Quite the graceful recovery, indeed.