Apple Issues iPhone 2.0.1 Firmware Update
Version 2.0.1 is available by connecting the device to its host computer, launching iTunes, and clicking the "Update" button. The iPhone 3G update can also be manually downloaded here, and the iPhone's update can be downloaded here. The 250 MB download reportedly increases backup times, improves keyboard responsiveness, and reduces lag in some applications.
When Apple released the 2.0 version for the iPhone, iPhone 3G and iPod Touch earlier this month, it enabled new features like access to the Apple App Store, increased security, and enterprise capabilities.
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—Marin Perez, InformationWeek