The first developers preview version of iPhone OS 4.0, along with SDK for iPhone, iPod touch and iPad was made available for download. If you have a membership of the iPhone Developer Standard or Enterprise Program, you can download iPhone 4 firmware for iPhone 3G, 3GS & iPod Touch 2G & 3G.
Does not have membership? Do not Worry! No need to wait till Apple releases iPhone OS 4.0 in summer 2010. iPhone OS 4.0 Beta dev preview has been leaked and is available for download for iPod Touch 3G, 2G and iPhone 3GS and 3G.
If you want to install iPhone 4.0 firmware on your iPhone then use the following link to download iPhone OS 4 firmware.
Download iPhone OS 4.0 Leaked firmware
Download iPhone OS 4.0 Firmware
Note: You NEED to register your device ID with a Dev Account to use it.
via blogsdna
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