Once you did that your iPhone will get updated with the latest iOS. Step 4 Confirm after hitting 'Download and Update' button. Step 3 Tap the 'Download and Update' button on the popup window, right after clicking the 'Check for Update' button. Click 'Summary' on the side panel to see your iPhone information and click on the 'Check for Update' tab. Open the iTunes interface and tap on your 'device' icon from the top corner. Step 2 Take a faultless lightning cable and connect your computer to your iPhone. Step 1 First, you need to update the iTunes firmware to its latest or install it. Tip: Prior to updating your device, it is recommended that you should back up all your important data using iTunes or iCloud. So, here is how to do that – through iTunes and through wirelessly. The process to update your iOS is not at all complicated you can do it with simple steps, sans any tech-geeks' help. Make sure to update the firmware of your iPhone, so that any App you install into your device works seamlessly without any glitches. Solution 1: Update the iOS Firmware for Your iPhone