Help Samsung Galaxy A5

Hi there, as the title i have a Samsung Galaxy A5 (sm-a500fu) i downgrade Lollipop to KitKat "A500FUXXU1AOB4_A500FUWIN1AOC1_A500FUXXU1AOB4_HOME .tar" with Odin. It completed all upload and when it's the moment to restart the phone.... nothing...... phone never restarted again..... no charge, no downloading mode and no recovery.

I rooted Lollipop before downgrade!!!

Now what i have to do? Someone can help me?

My phone is in warranty.... if i go to my assistant shop.... they discover that i rooted my phone and i lose my warranty?

Pls help.... i searched on this forum.... and on google.... but i haven't found nothing.