Something similar happened to mine last night while i was updating the IOS. Downloaded the ios and i got the error unable to update iphone due to error 9. Went to apple logo screen and had to reboot.
I did a backup before i updated so thankfully nothing was lost. Had to reset to factory settings and restore from the backup.
Apparently, the cable i used was faulty after i did a search online. But nothing happened when i did my back up.
Switched cables to reset to factory setting and restored my iphone via my last backup
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