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 Longcheer modems from manufacturers drop down menu list, then click magnifying glass button

Wait till program detects it

Open Unlocking tab, click “Unlock” button, wait for device to be unlocked.

After you see that modem was successfully unlocked, restart it by disconnecting and connecting back. Now you can use it with any SIM card.