My iPhone isn't turning on. i had an otb 1.0.2 and upgraded it to 1.1.2 later on with anysim , until lately i upgraded it to 1.1.3 and everything was fine until i noticed that the SMS was not working properly so i was trying to downgrade the BaseBand , and whilr doing that i kept receiving errors that the downgrade was not successfull so idecided to go back to 1.1.1 and suddenly i got an ERROR 6 , and my iphone turned off and wouldn't turn on again.

I've tried:
a) plugging the device into the dock (for fear that the battery may have drained), but the iPhone doesn't make the chirping noise, nor does it turn on the screen to show the battery meter.

b) pressing the Home, Lock, and Mute/Unmute keys and switches.

Does anyone know what's wrong with it?

Thanks in advance for your help and your time