Video tutorial

Download drivers here

Extract them in your computer and launch "DriverSetup.exe".

NOTE: Drivers must be downloaded from this procedure only. Installing other drivers might not make phone visible for DC-Unlocker software, so no possibility to unlock.

Wait till drivers fully install and this message disappear. After message disappeared, restart computer (necessary step).

Turn off phone. Press and hold "Volume down", "Volume up" and "Power" buttons for 5 seconds.
Phone screen should become purple/pink.
Connect phone to computer using USB cable.

Launch DC-Unlocker client software.

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, do not enter username and password, only click "Check login".

Select manufacturer: Huawei phones, model leave Auto detect (recommended).
Press "Detect" button (Big magnifying glass).

Wait till DC-Unlocker fully detects phone.

Open Unlocking tab, click "Unlock".

Wait till you see a message that phone is unlocked.

After you see that unlock is successful, restart phone.