How to restore iphone 3gs to 6.1.2 plus unlock

1.download letest sn0wbreeze-v2.9.11.exe
2.Download 6.1.2 ipsw at there
3.select semple mode
4.it promt you to active your iphone or not, select yes
5.builed ipsw automaticaly past on your destop
6.open itune ,prest left shift key and select ipsw
7.press restore and wait untill it finished
8.after restore evas0n automaticaly hactivat your phone(don't touch your phone after restored by itune)
9.all done now your phone is hactivated and prity cydia icone on you iphone.
10.type this repo in cydia-manage-edit-add repo666.ultrasn0w.com
and install it to unlock your phone.
 11.enjoy your jailbrak - unlocked phone.

gOOD Luck