Default Need original firmware Phone! (Spreadtrum sc6820)or S7100P

Hi all,

I have S7100P Chinese phone with Spreadtrum 6820 CPU. I tried to install a new firmware, but the phone was bricked. Now I installed another firmware with ResearchDownloader nothing appears on the screen.

I need the original firmware for the phone but I can't find it anywhere. Has anybody made a backup (.pac) file for this phone? Who can share it? I really need your help.

This is the phone: