Here is the step by step guide to update iPad, iPhone 3GS, iPhone 4, iPhone 3G and iPod Touch to latest iOS 4.2 [GM Release]. Though we were planning to share this type of post after the release of iOS 4.2 final build, but due to delay in the release of iOS 4.2 public version we are writing it right now for those who want to get their hands dirty.
If you are not following the updates, you can read a detailed post about iOS 4.2 delay here. Find the easy step for update after the break.
Step 1: Download and install iTunes 10.1 Beta 2.
Step 2: Download the right gold master build of iOS 4.2 for your idevice.
Step 3: Open the iTunes and connect your phone via USB.
Step 4: Hold down the Alt button (Shift in case of Windows) and click on the restore button.
Step 5: When asked for firmware file, point the iTunes to the downloaded iOS 4.2 file.
Step 6: Wait for 15 – 30 minutes and let the iTunes to finish its work.
Once update is complete, restart your phone and enjoy the iOS 4.2 features.
Note: If you want to keep the untethered jailbreak in future, please save the SHSH Blobs for iOS 4.1 prior to iOS 4.2 update. And if you rely on unlock, never try to update your phone becuase no unlock is available for iOS 4.1 and above yet.
Disclaimer: This guide is for testing and educational purposes only. Please don’t try it if you don’t know what you are going to do. This site will not be responsible for any type of damage or data loss.