Yesterday Apple revealed the much awaited iPhone OS 4.0 featuring multitasking, Folders, iAd advertising platform and GameCenter which will bring matchmaking, Leaderboards, Achievements to the Apple gaming platform for iPhone/iPad/iPodTouch. Upcoming iPhone HD will be featuring the OS 4.0 by default when it releases this June.
If you want to experience the goodness of iPhone OS 4.0 now, then you can download the 4.0 beta firmware which has recently leaked online.
Download links for iPhone 4.0 SDK and iPhone 4.0 Firmware
Download iPhone SDK 4 Beta
or from this location
Download firmware 4.0 for iPhone
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