Hello Riccardo,
Thanks for using Apple Support Communities.
I see from your post that your iPhone is unresponsive, will not boot up completely, nor can you restore through iTunes. To help troubleshoot this issue I'd like you to please reinstall iOS by following the steps below.
You might see the Apple logo or a red or blue screen for a long time during start up. Try these steps:
- Connect your device to a computer and open iTunes. If you don't have a computer, you can borrow one, or go to an Apple Retail Store or Apple Authorized Service Provider for help.
- While your device is connected, force it to restart. Press and hold the Sleep/Wake and Home buttons at the same time. Don't release when you see the Apple logo. Keep holding until you see the Recovery mode screen.
- When you get the option to restore or update, choose Update. iTunes will try to reinstall iOS without erasing your data.
iTunes will download the software for your device. If it takes more than 15 minutes, your device will exit recovery mode and you'll need to repeat steps 2 and 3 again.
Contact Apple Support to set up service if you have any of these issues:
- You still see a black screen after charging, force restarting, or following the steps in this article.
- You see a black screen, but can hear alerts, sounds, and vibrations.
- Your screen is on, but it doesn't respond to when you tap, slide, or try other gestures.
- You can't force your device to restart because your Home button or Sleep/Wake button is broken or stuck.
- Your device is stuck on the Apple logo, displays a solid color, or isn't recognized in iTunes.
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
Take care.
