Connect it to PC and install drivers (install HiSuite softwarefor drivers). Then put phone in manufacture mode. On dialpad type *#*#2846579#*#* (On tablets without dial pad use inbuilt calculator in landscape mode to dial ()()2846579()()= marked in red), select “Project Menu”, “Background settings”, “USB ports settings”, “Manufacture mode”.
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