Para dun sa Redsnow and for the IPSW, just google it lang sir, free lang po mga yun. It's up to you kung saan sa 2 method ang gagawin mo. So yung mga tools na gagamitin mo are the following:
1st Method (ito po yung pinaka-common method at tried & tested na for me)
4.2.1 IPSW
redsn0w_win_0.9.6b6
2nd Method (for 6.1.3 ios tethered jailbreaking)
6.0 IPSW
redsn0w_win_0.9.15b3
Make the 6.15.00 modem firmware as your last resort. So gawin nyo nalang muna yung process before resorting to this modem firmware.
@sir lance - yung sa evaders team po which is the evasion, ang support na ios po nun is 6.0 - 6.1.2 so if ever mag-update ka through itunes, 6.1.3 po ang latest na ios so hindi uubra ang evasion for jailbreaking.