Can’t able to update software in my iphone

If your iPhone, iPad or iPod touch won’t update - "You might be unable to update your iPhone, iPad, or iPod touch wirelessly — or over the air — for one of these reasons", with more detail in this link. --> https://support.apple.com/HT201435

If you can't update or restore your iPhone, iPad, or iPod touch - You can put your iOS device into recovery mode, then restore it using Music/iTunes.https://support.apple.com/HT201263

If you see an error when you update or restore your iPhone, iPad, or iPod, click here --> https://support.apple.com/HT201210