There was no point in creating this post, but because I was affected before due to Useless and Fake Unlocking Methods / Firmwares / dashboards to unlock this modem, posts all over the Web, I am here to warn you about the same.
>> Please do not follow any tutorial on other blogs, which convey unlocking this PRE-UNLOCKED modem or change its Dashboard !! not following this warning will damage your modem permanently and will no be replaced by Vodafone as your warranty will get VOID. This modem is Factory-Unlocked !
>> For Surprise, This wonderful Vodafone K3770-Z modem comes Pre-Unlocked from factory, So you need not attempt to flash its firmware with custom one.
>> It is necessary that you let install Vodafone Mobile Broadband Lite Software (Default Dashboard), when u just Plug-in your K3770-z USB Modem for the first time in your Laptop / PC.
So here we go,
>> The Vodafone K3770-Z modem comes with its on Connection Manager "Vodafone mobile broadband" Which will only accept Vodafone SIM cards.(It is necessary that you use a VODAFONE SIM card only for the first time Install), But if you Ignore (Press Close) the pop-up message shown by it, soon you will discover It starts showing the signal strength which means, it accepts other sim cards explicitly.
>> All you have to do now is, Close this connection manager and Single Left-Click on the Network icon near clock in Windows 7 to show up connections.
>> In it, it will show all the Connections that your PC has support for, including the K3770-z USB modem with Signals Bars.
>> Right click on this USB Modem Connection and Select Properties, You should see a Window showing up like this:
>> Now Select the "Profile" Tab (2nd), Enter the APN of your Mobile Service Provider (must enter), Username and Password (leave blank if not provided).
>> And hit "OK". Congratulations ! Now you can Press - "Connect" from the Left click Menu on the Network Icon near the clock. The connection will dial and disappear automatically.
See I just transfered 950mb in just 29minutes on Airtel 3G. hahaha :D :P. This is a Windows 8 snapshot below:
>> Problem : You will not see the "Profile" tab in Properties. The "Profile" tab will not come, If you used another SIM card (Non-Vodafone) for the First time install.
>> Solution: Put Vodafone SIM card in it, once it is recognized by Vodafone Software, you can then replace it with any SIM cards and use them. This has to be done only once for every new PC / Laptop you plug your USB Data Card for the first time.
If you wish to use this modem on Windows 8 also Follow this link: Vodafone K3770-Z ON Windows 8
If you wish to use this modem on Linux also Follow this link:
Vodafone K3770-Z on Linux Ubuntu, Mint