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If you need to upgrade iPad to iOS 12.3.1, there are several ways you can resort to complete this task. Follow one of them shown below.

If you can't update iPhone iOS software wirelessly throug WiFi connection, you could give iTunes a try. As the all-inclusive iOS device manager center, iTunes provides multiple effective assistances for you, including: backing up iOS devices, restoring iOS devices, transferring iOS data files, and updating iOS devices. You could follow the below steps to learn how to update iPhone software with iTunes in detail:

1. Install the latest version of iTunes on your computer.
2. Connect your iPhone to your computer via the USB cable.
3. Open iTunes and select your device.
4. Click "Summary > Check for Update".
5. Once iTunes detects the available update, click "Download and Update".
6. If asked, enter your passcode. Then iTunes would start to update iPhone iOS software. When it's finished, disconnect your iPhone with computer.

For more methods, check: How to Update iPad iOS to 12.3.1

There are several methods to update iPhone and following below steps can help you to reach this aim easier.

How to Update iPhone Software Wirelessly If a message says that an update is available, you could then click "Install Now" button to start to update your iPhone iOS software. Also, you could manually check whether there is an iPhone iOS update or not on your iPhone. The below steps would show you how to update iPhone software wirelessly:

1. Before you update iPhone software via WiFi connection, you need to make sure your iPhone has enough storage and battery to support the iPhone update.
2. Connect your iPhone to a WiFi network.
3. Tap "Settings > General > Software Update" successively.
4. Tap "Download and Install" option when your iPhone has detects an update available. If a message asks to temporarily remove apps because iOS needs more space for the update, tap Continue or Cancel. Later, iOS will reinstall apps that it removed.
5. Then iPhone would start to download and install iOS update immediately. You only need to wait for the update complete.

How to Update iPhone Software with iTunes If you can't update iPhone iOS software wirelessly throug WiFi connection, you could give iTunes a try. As the all-inclusive iOS device manager center, iTunes provides multiple effective assistances for you, including: backing up iOS devices, restoring iOS devices, transferring iOS data files, and updating iOS devices. You could follow the below steps to learn how to update iPhone software with iTunes in detail:

1. Install the latest version of iTunes on your computer.
2. Connect your iPhone to your computer via the USB cable.
3. Open iTunes and select your device.
4. Click "Summary > Check for Update".
5. Once iTunes detects the available update, click "Download and Update".
6. If asked, enter your passcode. Then iTunes would start to update iPhone iOS software. When it's finished, disconnect your iPhone with computer.

For more methods, check: How to Update iPhone

it is not possible to update an iPhone 3 to iOS 6!
it supports only iOS 4.2 - not newer
For the iPad first generation (A1219) to update is only possible with connecting the device to iTunes on a computer.
- this model supports only iOS 4.2
- NO iOS 5/ 6/7/8

iOS 6 is possible only on iPhone 3GS / 4 / 4S
- For the iPhone before iOS 5 to update is only possible with connecting the device to iTunes on a computer.
- Plug it into your computer and open up iTunes under devices click on your iPhone and then click on check for update.

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
- Plug it into your computer and open up itunes under devices click on your iPhone and then click on check for update
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- 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
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you might need to do a hard reset or you could look up on youtube how to get pass the itune logo on an iphone

Found this article: http://www.digitaltrends.com/mobile/how-to-downgrade-to-ios-6/

You have to connect it to itunes and update the device to the newest ios.

then when in messages you press the picture left of where you type text.

Try to update the software using iTunes, this is a possible issue with iOS 4. Open iTunes, plug the iPhone in and wait for it to start up fully and appear in iTunes. Click on the phone and click Update, if that is unavailable, click Restore.

There are many ways to update iPhone. The easiest way is to update via air. Certainly, iTunes is another great choice. Just follow below steps.

Update iPhone to iOS 12 via Air
1. If a pop-up panel shows you that iPhone latest version iOS 12 is available, you can click on the "Install Now" button to start to update iPhone to iOS 12.
2. It is also accessible to check out if iOS 12 is available manually now. The following steps will instruct you to make it.
a) Connect iPhone to a good Wi-Fi network and make sure your iPhone storage is enough. You also need to ensure that the battery of your iPhone can support the update.
b) Click on "Settings > General > Software Update> Download and Install" successively and iPhone will start to download and install iOS 12 right away. Wait until the update is completed.

Update iPhone to iOS 12 via iTunes
1. In order to use iTunes to update iPhone to iOS 12, you can first download iOS 12 IPSW file from this website (click here).
2. Run the latest version of iTunes on computer and insert iPhone to computer.
3. Click on iPhone icon on iTunes interface and then hit "Summary> Check for Update".

4. Choose the IPSW firmware file that you have downloaded beforehand by performing the following actions in iTunes: >
Mac: OPTION + Click on the "Update" button in iTunes
Windows: SHIFT + Click on the 'Update' button in iTunes

5. Navigate to your computer folder to choose the IPSW file and then click on "Update" button to confirm that you would like to install iOS 12 in the pop-up panel.

6. Wait until the update is over and iOS 12 is installed on iPhone. In the end, your iPhone will reboot with iOS 12 successfully installed.

For more details, check: How to Update iPhone to Latest iOS 12