An easy guide to install IPSW file on iPhone/iPad with/without iTunes.

IPhone users should ever be notified to update the operating system (iOS) version to the latest one. It's a convenient way to update iPhone iOS through Wi-Fi. Also, you can use iTunes to do this. Besides, some iPhone users also can choose another method which uses the cellular data network (3G/4G) to update the system.

However, it will cost much time and data, because generally the data packet is large and the download speed of mobile network is not more fast than Wi-Fi. So it is a wise decision to use Wi-Fi to update iOS. At present, the latest version of iOS is iOS 7.1. IPhone users should ever be notified to update the operating system (iOS) version to the latest one. It’s a convenient way to update iPhone iOS through Wi-Fi. Also, you can use iTunes to do this. Besides, some iPhone users also can choose another method which uses the cellular data network (3G/4G) to update the system.

However, it will cost much time and data, because generally the data packet is large and the download speed of mobile network is not more fast than Wi-Fi. So it is a wise decision to use Wi-Fi to update iOS.

At present, the latest version of iOS is iOS 9. Not only the operating system needs to be updated but also the apps you have bought should be updated. • • • • • I: Different iPhone must use the proper version of iOS As we know, not all iPhone can support the latest iOS system, it depends on the generation of iPhone. Firstly, you must know which version of iOS your iPhone can support. IOS 5: If your iPhone is an iPhone 3GS or later generations, it will support iOS 5.

All the generations of iPad can support this system. If you want to use this version on your iPod touch, your iPod touch must be the 3rd generation or later. IOS 6: If your iPhone is an iPhone 4 or later generations, it will support iOS 6. All the generations of iPad can support this system. If you want to use this version on your iPod touch, your iPod touch must be the 5th generation or later.

IOS 7 & 8: If your iPhone is an iPhone 4S or later generations, it will support iOS 7 & 8. All the generations of iPad can support this system. If you want to use this version on your iPod touch, your iPod touch must be the 5th generation or later. Here is the most important advice: Before you update the iOS, you must do a backup to avoid the data loss.

II: Update iOS via Wi-Fi The method is very easy for iPhone users. Under the condition of a stable Wi-Fi network and a fully charged iPhone, updating the system is pretty easy. But if you forget to charge your iPhone, please do as the follow steps: Tips: 1. Please confirm the process of installation is not terminated accidentally in case iPhone gets into problems. When iPhone goes wrong in the process of updating, remember to enter the recovery mode to fix it.

If the issue gets worse, you can try the DFU mode to solve it. Find the button Settings, tap it, and then tap General.

Find the Software Update, the device will check whether your iOS is the latest one. If the system is not the latest one, the available update will be listed on iPhone. Please choose one update and select the Install Now or the Download and Install button. Please confirm it when the system asks you whether you prefer to download the new iOS version through Wi-Fi.

You will be notified to charge for the device.Then choose Agree, it starts to download. After complete it, the device will ask you if you want to update the iOS now or later. Tap Install, the logo and a bar which show the progress will be on the screen. Wait for a few minutes, the device will restart. The update completes.

III: Update iOS through iTunes 1. Update the current OS of iPhone to iOS 6 Step 1. Use the USB cable to connect the device to a computer, and then start iTunes. Generally the back up and synchrony will begin automatically. If it does not start, do it by hands. Tap the name of your iPhone from the menu in the left to start the update.

Select the button Summary, tap Check for Update, and then click on Update. If your iOS is not the latest version, iTunes will notify you to update.

Click on Download and Update. If any notification appears on the screen, please press OK for all. Then the device starts to install the update.

Wait for a few minutes, the device will restart. The update completes. Update the current OS of iPhone to iOS 7 & iOS 8 Step 1.

Use the USB cable to connect the device to computer, and then start iTunes. Generally the back up and synchrony will begin automatically. If it does not start, do it by hands. Tap the name of your iPhone from the menu in the left to start the update. Select the button Summary, tap Check for Update, and then click on Update. If your iOS is not the latest version, iTunes will notify you to update.