Just few notions, for those in trouble.
I did as suggested in this guide and summary on this blog My link
Didn't went through. So I played a bit.
Never got the phone to respond, and CMD screen to close. Instead, I installed zte drivers, and did what suggested. When phone restarts, prompt is still waiting for it - ignore prompt. You'll get FTM screen. Go to next step. Start QPST.
Step 10. there was no phone in QPST, so I had to add port manually. Quite simple, just browse, you should see USB port, or something. Select, go back, start backup. It should work, so please continue as suggested.
-Win 7 64-bit
Orange phone from spain orange