Help! I was helping my friend downgrade from 4.3.5 to 4.3.3 but after i done it, the screen just in blank black. I used Tinyumbrella, ireb and redsnow it dont help. When i use ireb and tinyumbrella and restore the ipod using itunes it will have apple logo and after its done restoring it still in black screen and nothing is responding. If u press home and power button for 10sec it also dont gives respond. Anyone can give me a solution here? or could help me fix this? Please help!