Download iOS 4.2.1 for iPad, iPhone

About the OS X Yosemite v10.10.1 Update

Updating your system

You should back up your system before installation. To do this you can use Time Machine.

Do not interrupt the installation process once you have started to update your system.

You may experience unexpected results if you have third-party system software modifications installed, or if you've modified the operating system through other means.

Use Software Update to check for the latest Apple software using the Mac App Store, including this update.

Other software updates available for your computer may appear, which you should install. Note that an update's size may vary from computer to computer when installed using Software Update. Also, some updates must be installed prior to others.

You can also download the manual update installer. This is a useful option when you need to update multiple computers, but only want to download the update once. Standalone installers are available from Apple Support Downloads.

Improves Wi-Fi reliability

Improves reliability when connecting to a Microsoft Exchange server

Resolves an issue that may prevent Mail from sending messages through certain email service providers

Addresses an issue prevents connecting to remote computers using Back to My Mac

Resolves an issue where sharing services, Notification Center widgets and Actions may not be available

Addresses an issue that could cause Notification Center settings to not be retained after a restart

Addresses an issue that might prevent the Mac App Store from displaying certain updates

Addresses an issue that could prevent some Mac mini computers from waking from sleep

Resolves an issue that might prevent Time Machine from displaying older backups

Addresses an issue that might prevent entering text in Japanese

Enterprise content

For enterprise customers, this update:

Allows you to append search domains for partially qualified domain names when performing DNS lookups (consult the discoveryd man page for more information)

Addresses an issue where the Mac App Store might offer an update to Apple Remote Desktop when the latest version is already installed

Security Content

For detailed information about the security content of this update, see Apple security updates.

Download iOS 4.2 for iPhone 3G

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