iOS 4.2.1 for iPhone, iPod Touch, iPad is here. Download iOS 4.2.1 for iPhone, iPod, iPad. iPad iOS 4.2.1 has got multi-tasking features and tons of other new features Apple has brought to the iPad. You need iTunes 10.1 to update your devices to the latest firmware iOS 4.2. Apple TV 2G also get upgrade to iOS 4.2.1.