At a specialized event today from Apple declared the Apple iPhone OS 4.0 which is limited for download to developers exclusively. Those users holding Apple developers account can download iPhone 4 firmware for iPhone 3G, 3GS & iPod Touch 2G & 3G.

Whereas standard users will entirely engender their hands on iPhone OS 4.0 in this  summer expectedly without any delays. With gracious bunch of brand-new features it is evident that iPhone users can’t arrest their excitement for such a long term, and many of us might be thinking to download the iPhone 4 dev preview build.

So if you can’t arrest your patience and eager to download, then it is available for download for iPod Touch 3G and 2G and similarly to iPhone 3G and 3GS, follow the link below:

Download iPhone Os 4.0 firmware via Think Different

Note: In order to install the 4.0 firmware on your iPod Touch or iPhone you must register your device id with Dev Account. Also consider the risk involved in testing the beta firmware, once installed it won’t allow you to downgrade it to previous firmware, and in the end you may lose the jailbreak forever.