In case you prefer to upgrade to iOS 8.3 directly from your iPhone, iPad or iPod touch, keep in mind that will require at least 50% battery or have the device connected to the charger, remember that the device will that downloading and installing the new operating system.
We repeat that you can upgrade to iOS 8.3 directly from your iOS device, also known as update via OTA (Over the Air), you will need to have at least the device battery charged to 50% and also have a WiFi connection.
If you have the above requirements then you can proceed to upgrade, for this you need to go to:
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Settings> General> Update software.
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Now click on Download and install.
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Enter the password required to update.
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In the terms and conditions have to press OK.
Once followed these steps will begin the process of downloading the new firmware, meanwhile can use the iPhone or iPad. When the download is complete you need to press on in the section Installing software update, the device restarts.
Now, when the iPhone is flown to light we will ask the password from our Apple ID, you may then ask us to verify phone numbers for FaceTime and iMessage. When we passed these configuration screens iPhone or iPad and will be ready to use with iOS 8.3.