Boot animation Changed, display doesn't work.

[AC Question]

Hi,
I'm Roshen and I did something really stupid.
I rooted my android device (Micromax Canvas A94 MAd) using VRoot. And it succeeded.
But I changed the boot logo. I replaced the original with an animation I created. Now nothing is shown on display.
Now I need to reinstall Android Jellybean 4.2.2. How can I do it from pc or micro sd card?
Thank You!