Why can’t install ios 17.1.4 after downloading it ?

There is NO iOS 17.1.4 released by Apple. The current iOS version is iOS 16.4. Which iPhone do you have? Which iOS version is currently installed on it?

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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
• 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.

abdelmouttaleb wrote:

15.7.4. not 17.1.4 , sorry 😐

it’s for Iphone 6s.

Axel Foley's reply lists the usual causes of this. (Though you can update over cellular—even with an iPhone 6s—if you have a Jetpack or MiFi or similar device from your cellular carrier, and sufficiently robust data cap.)

If you're still stuck, use a Mac or Windows PC to update your iPhone 6s.

Further info and links here: Update your iPhone or iPad - Apple Support

Which iOS version is currently installed on the iPhone 6s? What happens when you attempt to update your iPhone?

Axel F.

What model iPhone do you have?