Apple has just released an update to iOS 4.3.1 to iOS 4.3.2 for iPhone 4, iPhone 3GS, iPad 2, iPad, and iPod touch 4G/3G. Apple has also kicked out iOS 4.2.7 firmware for Verizon (CDMA iPhone 4). This update is not a big update, its out to fix the battery drainage issue, heating of iPhone 4, FaceTime connection and other issues.
To Update your device to new firmware, you just have to plugged your device via USB to your machine and run iTunes 10.2.1. Now you should see a prompt box, asking you to update your device to new version. Now just give a hit to the “Download and Update” button, it will automatically download the new firmware and update your device.
NOTE: MuscleNerd of iPhone Dev Team say, to Jailbreakers and Unlockers to stay away from the iOS 4.3.2 update, and must save your iOS 4.3.1 SHSH Blobs!
Direct Download Links for iOS 4.3.2 / 4.2.7 (Official from Apple)