Step 1: Plug your device into power and connect to the internet with Wi-Fi.
Step 2:Go to Settings > General, then tap Software Update.
Step 3:If you see two software update options available, choose the one that you want to install.
Step 4:Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install.
If you found that your iPhone is getting slow after updating to the latest iOS system, read this tutorial to fix: https://www.leawo.org/tutorial/how-to-fix-iphone-running-slow-1409.html?fixya=1409
On a iPhone 3 it is not possible to install iOS 6 !
IOS 6 is possible only on iPhone 3GS / 4 / 4S
- There are two ways to upgrade the iOS version of your iPhone, iPad, or iPod Touch - via connecting the device to iTunes on a computer
- or directly from within the device, but only since iOS 5, it is possible to upgrade the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update
Download Apple iOS 6
Apple iOS 6 Finally Available for Download Direct Download Link Download Apple iOS 6
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