Yu Yureka Plus bootloader

I recently purchased Yu Yureka Plus from Amazon. But when installing the new cyanogen update cm-12.0-YNG1TAS1K0-tomato-signed, something wrong happened. And afterwards the display is not giving a readable view. All I can see is some vertical lines of different width. It does not even detected in my PC in fastboot mode. I think the bootloader is crashed. Please help me.