hlep uregent please as soon as possible

I had stb from samsung model SFT-303 , I upgrade it for the official sit of samsung with the ver. 4.2. the problem when it finish the upgrading , the stb not response for any thing even I can not close it or off it through the remote control or from the front pannel always showing 0000 . When I connected to the TV. no signal comming from the stb.
please I need your support for the solution for this problem.

looking for your prompt replay soon, thank you in advance

best regards