Fix iOS 18.3/17.7 Unable to install update an error occurred installing on iPhone

iPhone and iPad users are always willing to use new iOS. This year, Apple’s new iOS version, iOS 17, was released. The New System’s iOS 17 features are a kingmaker, proving to have remarkable success from new features and user experience in iDevice or other Apple products. However, many iOS users have reported being Unable to install an Update or experiencing an Error when installing iOS.

Also, in this tutorial, I discussed and tried to fix problems related to being Unable to install the update in iOS or Can’t install new iOS for all the users step by step.

Can’t Install iOS Update on iPhone? Here’s How to Fix the Error

Solution 1: Free Up Storage on iOS device

• Check Available Free space on iOS device, Settings > General > About > Available. [At least 5 GB free space is required. Set up file size to approximately 2.5 to 2.9 gigabytes, but installation requires more space.] Because of insufficient space, the Download and Install option under Software Update will be grayed out. Many iOS/iPad Users are facing other issues, Download and install option is not showing and just showing Storage option.
• To make free space Go to the Settings > General > iPhone Storage > Follow the recommendations or Delete unused Media files under the photos. Remove Unused Application with the option of Offload app or Delete App.
• Also, Find the Downloaded iOS software update file that saved here [Under the iPhone Storage]. Tap on it and delete the file after following the troubleshooting solution below. After deleting it, you must re-download the iOS setup file on your iPhone.

Solution 2: Check Battery Percentage

• Your iPhone charged at least 50% when you started the installation. Please keep the original USB lightning cable connected to your iPhone to download or update the old iOS version because it’s required.

Solution 3: Good internet connection

• Some big updates take more internet bandwidth and good internet signal strength. Alternatively, we can use iTunes (Given guide in the last of the article).

Solution 4: Reboot or Force Restart/ Hard Reset

iPhone 8 Plus/8 Plus and later iPhone:

1. Press and Quickly Release Volume Up button,
2. Then, Press and Quickly Release Volume Down Button,
3. After that only Press and Hold Side Button until you see the Apple logo on Screen. Now turning on back using the Side/Power button. Press & Hold on Sleep/Power button until iPhone screen show startup apple logo on the screen.

• For iPhone SE users: Press and hold the Sleep/Wake + Volume Down button simultaneously until the Apple logo appears on the screen.

iPhone update stuck on progress bar & Unresponsive: the whole process of update iOS, first take backup your data & Settings in the separate root folder and then restore on new iOS automatically. So obviously it will take too much time, calm down and sit back, wait to complete the process.

Solution 5: Reset Network Settings

By resetting all Network settings, Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. iDevice completely erases old network configurations, DNS settings, Especially for travelers and international users. Now Reconnect the WiFi because all WiFi password erased, manually pair after Reset Network settings.

Solution 6: Force Close Settings app

using the iOS app switcher and Force close the settings app on the iOS device. Re-launch settings app on the home screen and fix all the problems related to update or install.

Enable/ Disable Airplane Mode: Airplane mode is auto turn off Cellular Data, the Carrier signal, and WiFi. From the Control center Turn on for 10 seconds and Turn off again. Now try to install iOS 17 update on iPhone, iPad, or iPod Touch.

Insufficient storage [iPhone Won’t Update iOS 17]: Lack of free storage on iPhone, first you go for download latest iOS 17 version, So you must need free space, Free up storage on update/ or Free up space on iPhone.