How to fix a frozen or unresponsive iPhoneForce Restart your iPhone. This will help eliminate the errors that are causing your iPhone to freeze without erasing your apps or data. The most common cause of this problem is usually a problem with the iOS system. So, it makes sense that the best way to fix an iPhone that freezes during or after an update is to use an iOS system repair tool.
We recommend using the iToolab FixGo iOS system repair tool. If your iPhone is almost out of battery and freezes during the update, you can try keeping the frozen iPhone charged with a USB cable so that it updates normally. You can take it to the nearest Apple support center and they will fix it for you, but if your iPhone has an expired warranty, the company will charge you a lot of money to repair the device. If you find that you can't force a restart, or if you find that your iPhone screen is still frozen after the update or during its installation, the next best step will be to put the phone into recovery mode, allowing the iPhone to restart the system with the bare minimum to interact with iTunes and quickly reinstall iOS.