Apple Download Ipsw 6.1.3

We are also sharing the official direct download links of apple ios 6.1.3 ipsw firmwares (final version) for iphone 5, iphone 4s, iphone 4, iphone 3gs, ipad 4, ipad 3, ipad 2, ipad mini, ipod 5g touch and ipod 4g touch devices.. I've been trying for days to manually download a "valid" ipsw file for ios 6.1.3 iphone 3gs using different computers