[Q] root Xperia P 6.2.A.0.400 with locked bootloader topic

Hello guys i need a bit of help here.I want to root my phone ,I got Xperia P LT22i android 4.1.2 (build 6.2.A.0.400) bin4ry and other programs didnt help me , my device says that i cant unlock bootloader in the configurations ,What can i do to root my phone ? is there other methods to root a phone ?
Thanks in advance