Q: what is error 9 in iphone6

Error 9 and error 14 seem to be linked. Have you ever had your phone repaired at an independent repair shop? Was there an initial problem that prompted you to restore it in the first place?

Get help with iOS update and restore errors - Apple Support

Check your security software

Errors: 2, 4, 6, 9, 1611, 9006.

Sometimes security software can stop your device from communicating with either the Apple update server or with your device.

Check your security software and settings to make sure that they aren't blocking a connection to the Apple servers.

If you still see the error message, check for USB connection issues.

Are you seeing this when you're trying to update your phone using iTunes? If so, you may have security software that's preventing a connection with Apple's servers. See this article:

Get help with iOS update and restore errors - Apple Support    

Edit: looks like KiltedTim beat me to it!