[Question] how to unlock bootloder of mtk6572?

[MeSsi]

Hi guys
I have i ball andy 4 arc mtk6572 phone I flashed cwm recovery using mtk Droid tools
But my device is not booting into cwm recovery just stucked on logo but it's not bricked i can boot it normally
Then i flashed philz recovery using Easy magic Phillz recovery tool but same thing happened
Then i tried to flash twrp recovery using Easy twrp magic tool
It says ur boot. Img is secured continue anyway i said yes and it flashed successfully
But same thing happened again
My device is not booting in recovery
I got info from somewhere that for flashing cwm i have to unlock my bootloder but how to check that our bootloder is locked or not
And how to unlock it?
Help me