i cannot restore Os to my 3gs

i used : tinyumbrella , iREB 4.0.x-4.1-RC2,sn0wbreeze-v2.7r2 but neither do I not fix

Also my problem is in itunes

the iphone iphone could not be restored an unknown error eccurred (1015).


we could not be completed your itunes store request an uknowon error eccurred(-9808)


where to find one for the iPhone 3G's OS to work with

or do any of these