Download firmware update here

Extract updater and launch "E177Update_11.126.25.00.221_B427.exe"

Select "I accept the agreement", click "Next"

Wizard will start to update modem firmware. Do not disconnect modem or turn off computer

Launch DC-Unlocker client

Detect device by selecting Huawei modems from manufacturers drop down menu list, select model leave on Auto detect (recommended), then click magnifying glass button

Wait till program detects it

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 "

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.