I solved this error by insisting again and again to restore it but constantly gave error 9. The cable for the restoration I bought it again for security. I solved the problem as follows:
1) Tried about 5 times to restore unsuccessfully (error 9)
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2) I removed the screen and tried to restore 2 times unsuccessfully (error 9 again)
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3) I reconnected the screen and tried to restore it successfully.
Error 9 solved.
I solved this error by insisting again and again to restore it but constantly gave error 9. The cable for the restoration I bought it again for security. I solved the problem as follows:
1) Tried about 5 times to restore unsuccessfully (error 9)
2) I removed the screen and tried to restore 2 times unsuccessfully (error 9 again)
3) I reconnected the screen and tried to restore it successfully.
I hope you find it useful to my information.
Products used:
i) macbook pro retina (el capitan 10.11.3)
ii) iTunes 12.3.2.35
iii) original original cable