Why is iOS 15.6 failing to install?

Why are you attempting to update to iOS 15.6 which is not available for installation? Apple is not signing that version anymore. You have an iPhone 14 so you should be looking to update to iOS version 16.5.

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Make sure that your iPhone is setup to meet the following requirements before you attempt to update the iOS version over a Wi-Fi Network. Open Settings ➡️ General ➡️ Software Update: If there is an update available for your iPhone then it will be listed here. Follow the on-screen instructions to download and update your iPhone. 

• Your iPhone must have a fast Wi-Fi connection; you cannot update over cellular data or a cellular hotspot
• Ensure that you do not have a beta profile installed from a previous version
• The iPhone can not be in Low Power mode
• The battery state of charge must be above 50%
• Your iPhone must have at least 8GB or more free storage space
• Your iPhone cannot be connected through VPN
• You should leave the phone plugged in until it finishes updating, both to assure that it remains above 50% and to keep Wi-Fi enabled (Wi-Fi turns off when the phone sleeps if not connected to power).

Axel F.

Hello track177!

If your iPhone or iPad won't update - Apple Support, then please see this link to learn what to do next.

I hope this is helpful. Good Luck!

track177 Said:

"iOS 15.6 Please anyone guide me Why is iOS 15.6 failing to install?"

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Successfully Updating an iPhone:

Use my User Tips...

A. Troubleshooting an Update not Responding:

Boot Loop: Perhaps it is stuck in a boot loop? This can occur when updating, and it got frozen.  So, user MY User Tip: How to Fix an iPhone in a Boot Loop - User Tip

B. Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Update your iPhone Using a Computer - User Tip