recovery not working

[naj1054]

i set my 3gs iphone into dfu mode to restore it and it did, but then it went back and my itunes kept recognizing it has an iphone in recovery mode and now it wont restore, it keeps saying this iphone is not eligiable. what do i need to do?
thanks

 

[hexonxonx]

i set my 3gs iphone into dfu mode to restore it and it did, but then it went back and my itunes kept recognizing it has an iphone in recovery mode and now it wont restore, it keeps saying this iphone is not eligiable. what do i need to do?
thanks

You can only restore your 3GS to the current OS which is 4.0 now. You can't restore to a previous build so that is why it is saying it is not eligible.