How to use DC unlocker cracked version tutorial is here. To get working download link of cracked version DC unlocker software see the latest comment. I keep updating new download link.
To unlock your ZTE MF637 3G Modem free using DC unlocker cracked version:
1. Download the DC unlocker cracked version.
2. Now unzip the downloaded file and extract in a folder.
3. Now disconnect from the internet and change the SIM with another network provider to detect your ZTE MF637 3G Modem dongle properly by DC unlocker software.
4. Now plug the modem into PC and let it install all required drivers.
5. When dashboard/software of ZTE MF637 3G Modem opens then close it.
6. Now run DC unlocker cracked version.
7. Select ZTE tab from drop down.
8. Now click on search magnifying glass.
9. Now after successfully connected your modem in DC Unlocker click on Unlock.
10. Now your modem is unlocked forever.
If you don’t want to use DC Unlocker cracked version then download the firmware of ZTE MF637 Firmware from the Polish operator ERA DL_MF637_TMO_PL_0B05V1.00.00. Update the firmware of your ZTE MF637 3G Modem and it will unlock your modem forever.
If your device is asking for unlock code after changing the SIM card then you can directly place an order at ZTE server.