Hi! All. I have 4 iphone 3gs

1) 2 tethered 3gs which was jb using blackrain(1 has 3.1.2 &
3.1.3 shsh saved in cydia, another only has 3.1.3 shsh saved)

2) another 2 3gs which is not jb 1 on 3.1.2 firmware & another
upgraded from 3.1.2 to 3.1.3.

need to know how to jb them using spirit. I understand for tethered jb sets, i need to do a restore but not sure how a restore is done.