Download iOS 4.2.1 for iPad, iPhone

About the OS X Yosemite v10.10.1 Update
Updating your systemYou 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 modifiions installed, or if you've modified the operating system through other mns.Use Software Update to check for the latest software using the Mac App Store, including this update.Other software updates available for your computer may appr, 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 Support Downloads.


Improves Wi-Fi reliabilityImproves reliability when connecting to a Exchange serverResolves an issue that may prevent Mail from sending messages through certain email service providersAddresses an issue prevents connecting to remote computers using Back to My MacResolves an issue where sharing services, Notifiion Center widgets and Actions may not be availableAddresses an issue that could cause Notifiion Center settings to not be retained after a restartAddresses an issue that might prevent the Mac App Store from displaying certain updatesAddresses an issue that could prevent some Mac mini computers from waking from sleepResolves an issue that might prevent Time Machine from displaying older backupsAddresses an issue that might prevent entering text in Japanese

Enterprise content
For enterprise customers, this update:
Allows you to append srch 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 Remote Desktop when the latest version is alrdy installed

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




Download iOS 4.2 for iPhone 3G