Hello, I have an iPad Air (A1474). It was working fine, no damage or anything. I was using it one day, and the screen suddenly just went blank like it turned off, even though it was around 90%. I tried charging it, but to no effect. I connected it to a PC with iTunes (12.9.3.3). It says the iPad is in recovery mode. I can choose to Restore and Update. The software downloads and is extracted. It then says the iPad is being prepared, and the Apple logo appears on the iPad screen. A progress bar then appears on the screen for a few seconds, but then iTunes says an unknown error occurred. Last night, it said error 9, but today it says 4000. The Apple logo then goes away. At night, you can tell that it stays backlit for a little while. I can't get it to do anything other than showing the logo upon attempted restore. I tried contacting Apple support, but they think it needs to be seen or sent in. I wondered if anyone else has any ideas. I saw things about Reiboot, but it's not free for the OS repair. I'd pay for a month if it worked, but I don't want to waste my money if it doesn't. Thanks!