How we can help me update my iOS 14.3 to last version please? I have a iPhone 8

Hello,

There are different ways to ensure the highest iOS that your device will support is installed on your device.

This support article has instructions about updating an iPhone or iPad wirelessly --> Update your iPhone or iPad - Apple Support

You can also use Mac and PC computers to update system software: Update iOS on iPhone - Apple Support

When updating, your device will update to the highest version currently available that it will support, or it will just say it is up to date and won't install anything. With an iPhone 8 or higher, you can update to the latest iOS, 16.3.1

luckner231 Said:

"Help me update my iOS 14.3 to last version"

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Updating an iPhone:

Use a Computer and Ethernet:

Start with attempting an update through use of a computer. If you cannot use Wi-Fi, then use Ethernet.  See my User Tip: Update your iPhone Using a Computer - User Tip.