i m not able to share the same link as i have in PC coz i have download that file from some paid torrent server so i can't share it u may able to use any of the 4.1 custom or 4.2.1
4.1 custom is better coz after that u use the redsnow to jailbreak
4.2.1 custom need some more work out as i told u to do
search for some torrent that is unpaid and free try at your own risk
Custom 4.1 custom 4.2.1