General error with redns0w

hi guys
@ wits end
try days jailbreak on 3gs without luck.
run redsn0w_mac_0.9.10b6 jailbreak phone 3gs runing on 5.1? (updated itunes in restore) try create custom ipsw no_bb_iphone2,1_5.1_9b176_restore.ipsw "custom ipsw creation failed general error."
fault??

 

you got latest itunes version installed?

 

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