Untethered Jailbreak for iPhone 3.1.2 baseband 05.11.07

These are not precise instructions, just a hint for a successful jailbreak and unlock for 3GS. it worked on iPhone 3GS 3.1.2 with 05.11.07 modem firmware 1) restore from original Apple firmware : iPhone2,1_3.1.2_7D11_Restore.ipsw 2) then activate with a official carriers SIMcard 3) do the Spirit magic (http://spiritjb.com/) 4) install ultrasn0w using Cydia 5) if stuck on "searching..." "no service" add http://cydia.pushfix.info/ source to Cydia and install "blacksn0w RC2 Final". That did the trick.