What the fone firmware version ? find it n dvds .
connect fone with TP ," mark Operate in Blank mode " then press connect . your fone should be connect to sw . then load full flash ( same as your fone firmware version ) then press flash .
after all your fone should be alive . after that if fone's boot-loader version is under 0A.52 just unlock it directly . no need to write boot on that .
Have a good luck .