Not updating to 14.4

Use internet speed over 15 Mbps (both download and upload) speed for error free update. Avoid latching on to Hotspot or WiFi Extenders

VPN or proxy connections might prevent your device from contacting the update servers.

• Get help with over-the-air iOS updates - Apple Support

• Remove and download the iOS update again

If you still can't install the latest version of iOS, try downloading the update again:

1. Go to Settings > General > [Device name] Storage.

1. Find the iOS update in the list of apps.

1. Tap the iOS update, then tap Delete Update.

1. Go to Settings > General > Software Update and download the latest iOS update.

If you don’t see the update in the list of apps or if the issue happens again, you need to update your device with iTunes.

Try updating iOS after each step.

• Try Forget the WiFi network and add again

• Try another WiFi network 

• Toggle sets automatically off and then on

• Reset your network settings

• Force restart your device

• Remove any beta profiles, if applicable

• If everything fails: - Use iTunes or Finder (for MacOS Catalina+) to update your device instead of over-the-air

• Get help with iOS update and restore errors - Apple Support

• If you see an error when you update or restore your iPhone, iPad

iOS 14.4 just released. The Apple servers may be busy now. So please wait.

Still, if you are unable to update, please follow the recommendations below:

• Force quit the Settings app and then try.
• Restart your iPhone. If this does not help, consider force restarting.
• Make sure ample free storage is available on your iPhone. Delete unnecessary apps and media if needed to free space.
• Ensure your iPhone is charged or plugged into charging.
• Turn off VPN if you are using one. This includes DNS apps like 1.1.1.1 as well.
• Switch to a different Wi-Fi network.
• If nothing helps, connect your iPhone to Mac or PC. Next, open iTunes (on Mac running macOS Mojave and earlier or Windows PC) or Finder (on Mac running macOS Catalina or Big Sur). Trust the computer, if needed. Now, from the Summary tab, click on Update.

Hope it helps!