Turn off the phone. Make sure it is disconnected from PC. Install HiSuite for phone drivers if it is not yet installed.
Download HCU tool here
On “Account” tab enter your user name and password. Click “Check account” button and wait to be logged into the server
(You get account after credit purchase, check “BUY” page)
Put a check mark on “MTK Usb debug”, press “Read phone info” now connect phone to PC.
Wait for phone to be detected
Open “Unlock” tab and press “Read bootloader code” button
Wait for code to be read