I recently got an iPhone 6 plus with a cracked screen from a friend that had upgraded to the S8. I replaced the screen with one off ebay, and the phone still displayed things correctly, it just got stuck in a bootloop. I've tried updating via iTunes, using iTunes' recovery from an existing backup, and restoring to factory default via iTunes. Those all failed with error code 4013. I dug a little deeper and found a program called 3uTools. I've tried using that to flash it with the latest update, that also failed with error code -2. That error code means that there is a hardware problem. So, do any of y'all have and troubleshooting steps I can take to help identify the problem? I'm stuck in my house for the next few days (Thanks Harvey), so I'd like to get this problem fixed.