Thursday, 12 July 2012

How to unlock the Vodafone ZTE K3571-Z Dongle to use any SIM

This is a very basic guide on how to unlock your modem.  You will need:
K3571-Z Modem
Non Vofafone sim
Windows PC
DC Unlock
Generic ZTE dashboard (see optional step)

Install the VF (Vodafone) dongle software as per usual.  The drivers need to be installed for the dongle to be read be the computer.

Make sure the VF Dashboard works properly and you can get internet access from the dongle.

Now exit the VF dashboard software and ensure that any other VF Software is killed from task manager and Control Panel > Computer Mangement > Services (Look service starting with Vodafone...), stop and disable.
Make sure that all autoruns on the XP system are turned off as well (
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\NoDriveTypeAutorun  Value = FF in Hex


Open up Device Manager and have a look at the Ports (Com and LPT).  Insert Modem and see what port comes up as the Diagnostics Port when the modem is plugged in.
Take a note of the port and open up hyperterminal, selecting that com port and choose 9600, N, 8, 1 for setup.

Type ATZ and look for an OK
Now type the following commands and lok to see that you get success prompts.

Exit Hyperterminal and unplug the modem / replug the modem.  Open up Device Manager and have a look at the Ports (Com and LPT), you should notice that the description wording for the comports is different.  In my case before it was Vodafone and now it is ZTE.

Now you should be able to open up DC and unlock that sucker, just make sure that you have a non VF sim card in the modem or your DC program will say it is unlocked already.

Optional and really worth it

Uninstall all the VF crap, Go to and Download the ZTE Dashboard.
Open up the ISO using winrar or simmilar.  Install it on your system and use it with the modem.  The Join Air ZTE dashboard has all the drivers.

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  1. Thank you very much,
    I had to Hyperterminal into the secondary COM port to connect but it worked.

  2. Awesome! Works extremely well. Have now unlocked 2 of the same K3571-Z devices from Vodafone.

    The only one thing I found is that in one case, the initial Diagnostics Port was lying to me. The description in the Device Manager said the port was COM6, yet COM3 was the correct serial port to connect to; discovered via trial and error. For what it's worth to others, COM3 wasn't even listed in the device manager.

    Aside from that, thanks for the information!