It will only reset your personalized settings, and all your data like messages and photos will not be erased.

Settings > General > Reset > Reset All Settings.

If the message “iTunes is downloading the software for this iPhone” still shows on the screen, you may need to reset all settings to fix it.

And you can try to update or restore your device again. Once it’s back on, all your network settings will be cleared. Your phone will take a moment to restart. Scroll down to the end of the page and tap the Reset button.Open the app settings, tap the General tab.Knowing some easy steps will relieve you stress and help you cope with the trouble that iTunes is stuck installing software for your iPhone. And this will prevent iTunes to download the newest iOS 15 or other firmware smoothly. You don't have to be a tech-guru to reset network settings on your iPhone. Tap Remove App and then tap Delete App to uninstall it from iPhone. To uninstall the security app on your iPhone, simply touch and hold the security app on the Home Screen to open a quick actions menu. And if your meant to restore your iPhone and met this issue, please go to the common methods part.

That's to say, only when you intended to update the iPhone via iTunes and encountered the message 'iTunes is downloading the software update for this iPhone', these methods can work for you. The methods listed in this part are only effective for the functional iPhone. However, It may also take more than an hour for various reasons such as network failure, poor connection to Apple server or dead battery. Let's say 30 minutes to an hour, depending on how fast your iPhone can connect to the apple server to download the firmware or software. How Long Does iTunes Take to Download Software for iPhone?

Itunes downloading software for iphone