Make sure no sim is inside device before proceeding to detect/unlock steps.
Connect device to PC via male to male usb cable or charging cable for detecton and install everything that comes in it's drive (if it has one).
IMPORTANT! Open device manager on computer and make sure device appears there under network adapters, otherwise do not proceed as detection won't work if computer doesn't see device.
Launch DC-Unlocker client
Open Server tab, enter your username and password that you received after credits purchase. Click "Check login". (you can buy credits here www.dc-unlocker.com/buy).
If DC-Unlocker/Vygis/Rocker/Infinity dongle is connected, only click " Check login "
Detect device by selecting SierraWireless/NETGEAR from manufacturers drop down menu list, leave Select model as auto detect (recommended) then click magnifying glass button
Wait till program detects device
Open "Unlocking" tab, click “Network unlock” button
Wait for unlock to be completed. After that device will restart