How can I upgrade latest version

Which iPhone model do you want to upgrade?

The hardware of your iPhone has to support the latest iOS versions:

iOS 13 and iPadOS are compatible with these devices - Apple Support

iOS 14 and iPadOS are compatible with these devices - Apple Support

iOS 15 and iPadOS 15 are compatible with these devices - Apple Support

iOS 16 and iPadOS 16 are compatible with these devices - Apple Support

iPhone models compatible with iOS 17 - Apple Support

mahir267 Said:

"How can I upgrade latest version"

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Latest version of what? If the iOS, refer tot the following...

Please Provide More on your iPhone:

What's you iPhone model? What are you looking to update to? Without that being provided, read the following...

Updating an iPhone to iOS17:

Update Using a Computer:

What to Update: Installed apps and the iOS.

How to do so...

A. Verify Compatibility:

Identify your iPhone model. The first thing that comes to mind in incompatibility being the culprit. So, confirm the model of your iPhone. If iPhone model is incompatible with iOS 17, then it is because you iPhone does not meet the hardware requirements for this iOS version(s).

B. If Compatible...

1. Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

then...

2. Proceed with the Update:

Go Here:  Update your iPhone Using a Computer - User Tip

mahir267 Said:

"How can I upgrade latest version: model 6 please”

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Update Using a Computer:

Your device cannot go past iOS 12. So, try updating using a computer. If any updates are available, they will be installed sure enough. If you cannot connect using Wi-Fi you can try connecting using Ethernet.

See my User Tip:  Update your iPhone Using a Computer - User Tip

Update your iPhone, iPad, or iPod touch

• If you have an iPhone 6, the highest you can update to is 12.5.7

Go to Settings > General > Software Update.

This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone or iPad - Apple Support

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support

An iPhone 6 can't be updated beyond 12.5.7, it doesn't have the hardware required to run anything higher.

If you need a higher iOS version, you will have to purchase a newer phone.