How to upgrade to iOS 10 on iPhone, iPad and iPod touch

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Method 1: How to upgrade to iOS 10 through the iPhone, iPad, or iPod touch Software Update (OTA) system
For this method, the iPhone, iPad, and iPod touch device needs:

be connected to a power supply (or charged at least 50%)
connect a Wi-Fi network
to have at least 1.5GB-2GB of free storage (Note: Not as large will have to be free storage if you are turning to method 2 - updating using iTunes - since downloading the update will occur on your computer, and its size is quite large, several hundred MB or about 1 GB).
If it is impossible for you to meet the three conditions, then you can upgrade with Method 2 - update using the iTunes app on your Mac or PC. If you do all of it then:

1. Open the Settings app on your iPhone, iPad, or iPod touch main screen;

2. General Attitude;

3.Touch Software Update;

4.The iPhone, iPad, or iPod touch device will start looking for the new update. Once you've found it, touch the Download & Install button. Note: If the above button does not appear, you do not have enough storage to download the update, so you'll need to start deleting some media applications or files (read more in the How to Prepare Update for iOS 10 )

5.The screen will show the terms and conditions for installing the new version of the operating system. Touch the Done button to continue, then confirm that you agree;

6. Wait to download the new iOS version from your iPhone, iPad, or iPod touch (it can take a few minutes to several tens of minutes, depending on the speed of your Internet connection, your device, and how much Apple servers are required for )
Once downloaded, a dialog box will appear on the screen and ask you if you want to upgrade to iOS 10 now or postpone later. Choose the option you want (Install to begin the process immediately, or Later to return to a later date in the Configuration and make the update). If you do not select anything, after 10 seconds the iOS 10 installation will start automatically;
Start installing! The operation will take a few minutes while the Apple logo and a progress bar appear on your device screen;