If you can`t go to recovery mode normally, use Recboot:
Download RecBoot from here http://www.hack2learn.org/downloads/...Tool+-+Windows
Set it to go in Recovery Mode, then rewrite the firmware on it. In case you will be stuck in a Recovery Loop after the recovery has completed (or it gave some error along the process) then with RecBoot, press the 2nd option to get it out of Recovery.
Yes bro.. no os 4.. sory for that... its os 3.1.3..
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i have restore it by 3.1.3... so now jailbreak.... i have try to clear jailbreak by redsnow.. but there is not going phone in DFU mode...