MY IPHONE CAN NOT BE ACTIVATE 3GS AFTER UPGRARDING

That's too bad.

Did you have a question for us users here?

i had the same problem....i fixed it by downloading ios 4 for iphone 3gs then resn0w and going to extras then pwned DFU then follow the intructions. then open itunes hold shift while clicking restore(option on mac ithink) and choose the file for ios 4 then restore it