Felet ligger i att ni inte har nergraderat erat baseband utan har baseband-versionen från 1.1.2.
Såhär ska ni göra för att nergradera basebandet:
1. Make sure Modem version is 04.02.13_G in Settings → General → About.
2. Set Settings → General → Auto Lock → Never
3. Start Installer and install BSD SubSystem found in System Category.
4. Go to Sources and tap edit and add http://i.unlock.no/
5. Now install "BB Downgrader (1.1.2)" found in Unlocking Tools category. This will take around 5 minutes.
6. When done, restore your phone to get 1.1.1 firmware reinstalled.
7. When phone have been restored, you can Activate and unlock as normal.
Texten lånad från i.unlock.no
http://iphone.unlock.no/#how-to-downgrade-1.1.2