Hello, friend! I also meet this error about my cell phone, I get many help from this forum, and also bought many repair tools from china supplier , and VIP Pro Shop Team help me fix this error. maybe you can try it.
they website:
http://www.vipprogrammer.com.
They've solved my cell phone problem and I hope it will help you with your mobile phone trouble.
They have professional tools to unlock, Maybe you can try this unlock tool. It's very practical.