My 9.7" iPad Pro had just crashed last night. I immediately went back to 10.3.2. I'm waiting for public beta for reinstalling again. I already miss the iOS 11 features. 
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iPad Pro stuck booting
- Thread starter Justaguy48
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Happened to me as well: iPad Air2 (WiFi, iOS11) stuck booting on Apple logo.
Trying to recover using iTunes.
Trying to recover using iTunes.
Hmm... I see "An unknown error occurred (9)." while trying to recover using iTunes. Any suggestions?
My iPad Air 2 resprung when changing between Reduce Transparency and got stuck on the Apple logo. Hard reset didn't work, it just went back to the Apple logo. So I restored via DFU to 10.3.2 then updated to iOS 11 again.
Yesterday, I put my iPad on to charge when it was at around 7% ... three hours later I checked the iPad and it was at 9%. The iPad then started freezing, when pulling down Notification Center the settings app icon appeared in the middle, but was upside down! So I'm back on iOS 10.3.2 and missing the features of iOS 11 already.
Roll on the pubic beta.
Yesterday, I put my iPad on to charge when it was at around 7% ... three hours later I checked the iPad and it was at 9%. The iPad then started freezing, when pulling down Notification Center the settings app icon appeared in the middle, but was upside down! So I'm back on iOS 10.3.2 and missing the features of iOS 11 already.
Roll on the pubic beta.
My iPad Pro 12.9 Cellular today went to the Apple Boot screen and wouldn't boot. Had to restore with iTunes to 10.3.2, then didn't set anything up because all my backups said they were iOS 11 in the iCloud so I had to install profile, update to iOS 11 and now 2 hours later I'm still working on it. Have got the iCloud Backup failed 3 times already. Now it says there's a minute left and it's gotten farther than before so we shall see. I'm ready to pull my hair. Only iOS 8 beta was last to crash an iPad for me. So it's been a few years and I'm not happy.
UPDATE: Had to turn off Two Factor Auth, kept getting a VKS error when trying to setup the iCloud after the restore to iOS 10.3.2. Turning off Two Factor Auth made it go through right away. So if anyone is having issues, that may be the key.
UPDATE: Had to turn off Two Factor Auth, kept getting a VKS error when trying to setup the iCloud after the restore to iOS 10.3.2. Turning off Two Factor Auth made it go through right away. So if anyone is having issues, that may be the key.
And now the 2nd time today this has happened. Sticking with iOS 10.3.2 until next beta, hopefully it fixes issue... Mine happened with full battery also, but graphics glitches with folders forced me to restart...
Method 1: Hard Resetting Your iOS Device to Fix iTunes Error 9
Method 2: Fixing iPhone Error 9 by Updating Your iTunes
Method 3: Using a Different Computer
Method 4: Checking Your USB Cable and Ports
Method 5: Getting into Recovery Mode to Fix iTunes Error 9
Method 6: Checking Your Security Software and Firewall
Method 7: Using FoneDog - iOS System Recovery
---------- Quote from Google search : How to Completely Fix the iTunes Error 9 (iPhone Error 9)
There are more information about the methods.