iPhone is stuck in a boot loop and getting an Error -9 message.
Can not restore because of constant disconnecting - Error 9.
Re: iPhone is stuck in a boot loop and getting an Error -9 message.
Welcome to iMore!
Here is a guide by Apple in case you run into Error 9. And somethings you can try to solve it.
Re: iPhone is stuck in a boot loop and getting an Error -9 message.
Apple’s support page lists error 9 as a possible security software issue. This could be firewall blocking access to specific websites/web resources (like iTunes trying to download something from Apple’s servers). Some other websites (and users who’ve found some solutions) note this error as happening due to hardware issues (faulty cable, faulty USB port, accidentally disconnect etc.)