Connect the dongle to PC and close the default dashboard of Vodafone modem and install the downloaded Huawei mobile partner in PC. Now eject the data card from PC and insert aby other SIM card. Again plug the modem to PC. If Vodafone connection manager automatically gets launched then close it. Now open the installed dashboard (which has been downloaded from this article). Now its will ask you for password / unlock code.
Just provide unlock code as password to your modem. Now your modem is unlocked for ever. If by any reason, your modem does not ask for password then use Huawei modem code writer tool to send the NCK in your dongle.
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Vodafone Zte K3770z Modem Unlock Huawei K3770-Z Specifications: 1.UMTS 1700/2100MHz 2.GSM/GPRS/EDGE(850/900/1800/1900MHz) 3.Support: HSDPA data transfer speed up to 7.