Put phone in manufacture mode. On dialpad type *#*#2846579#*#*, select “Project Menu”, “Background settings”, “USB ports settings”, “Manufacture mode”. Then connect it to PC and install drivers (If you do not have separate driver pack for your device, install HiSuite software).
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)
Press “Read phone info” button and wait until phone is fully detected
Select “Unlock” tab
Press “Read Bootloader code” button and wait until code is provided on memo window