I cant find a solution...
I tryd to jb an iphone 3G 8Gb first generation... updated to 4.2.1(never jb before this and i restored too with itunes) with GreenPois0n(I tryd all versions) for Windows
phone is off and put it to dfu mode but all I get is "try again..." ...I tryd over and over and no good...
I also tryd with redsn0w_win_0.9.10b6 and all I get is: assertion failed... (allocate 223) ...