http://digg.com/apple/Unlock_your_iP..._via_downgrade

NOTE: using anySIM 1.2 is not recommended. I suggest to follow this guide to reflash and revirgin the correct baseband for the downgraded iPhone.

Hope it will help for those ibirck iPhone 1.1.2

This guide is tested under U.S. iPhone who upgraded to iPhone 1.1.2. For the new UK iPhone, I do not know whether it works or not. So, I need you guys input. Thanks.

The basic theory of this guide is go from iPhone 1.1.2 > 1.1.1 > 1.0.2, and then reflash the baseband and virgin it. After all, go from 1.0.2 > 1.1.1. In the end, you will have an unlocked and activated iPhone 1.1.1 with baseband 04.01.13_G. You will be able to use any SIM card you want.

And, you should not upgrade your unlocked iPhone 1.1.1 in any circumstances. This guide intended to help those accidentally upgraded iPhone. And also, this guide cannot guarantee will work 100% since I don’t know the status of your iPhone.

This guide is based on this post. It used Mac OS X 10.5 Leopard, iNdependence 1.3 beta 2 and iTunes 7.5.

Stage 1: Downgrade from 1.1.2 to 1.1.1 to 1.0.2

Step 1. Connect your iPhone to your Mac. Press and hold Home + Power button of your iPhone. Once the screen turns black, release the power button but keep on holding the Home button.

Step 2. Wait until iTunes tell you iPhone is in restore mode. Press Mac’s Option key, and than click restore button from iTunes. It should prompt you to select the files you want.

Step 3. Download the 1.1.1 firmware file here. Select this file from iTunes. It will start restore the iPhone 1.1.2 to 1.1.1. It will show you the following error at the end. But thats okay, just go on step 4.

Step 4. Download iPhone 1.0.2 firmware file here. Repeat Step 1-3, but this time choose the iPhone 1.0.2 file in iTunes to restore. If it shows you the error 1, close iTunes and open iNdependence now. Choose to enter DFU mode. Close iNdependence and open iTunes again to start the restore once you got the following message.

Step 5. It will show you 1013 error at the end. Close iTunes now and open iNdependence again once the restoration completed. Click the “Activation/SIM” tab. Choose to activate the iPhone. It will ask your extracted iPhone 1.0.2 firmware. To do it, rename the iPhone 1.0.2 we downloaded in Step 4 to iPhone1,1_1.0.2_1C28_Restore.zip, extract it using StuffIt Expander.

Step 6. Install SSH by clicking “SSH” tab through iNdependence. Follow the on-screen instructions.

Stage 2: Reflash and revirgin the iPhone.

Step 7. Connect to your iPhone, open Fugu. Type the iPhone’s IP address. (Find it from settings > Wi-Fi, choose the connected Wi-Fi’s blue arrow.) Download the pack here. Extract it and upload it to iPhone’s “/usr/bin”.

Step 8. Open Terminal. Type “ssh root@192.168.0.1″ (change 192.168.0.1 to your iPhone’s IP address). Type the following commands consequently. Make sure you press Enter key to execute it for each line:

launchctl remove com.apple.CommCenter

cd /usr/bin/

bbupdater -v

chmod +x ieraser

ieraser

bbupdater -v

bbupdater -e ICE03.14.08_G.eep -f ICE03.14.08_G.fls

bbupdater -v

Step 9. Make sure you see the 03.14.08_G baseband in the end of step 8. Shut down the iPhone now. Open it again. Connect to your iPhone again using Fugu. Remove the files we uploaded in step 7. Download the virgin pack here. Extract it and upload it to your iPhone’s “/usr/bin” by Fugu.

Step 10. Open Terminal. Type “ssh root@192.168.0.1″ (change 192.168.0.1 to your iPhone’s IP address). Type the following commands consequently. Make sure you press Enter key to execute it for each line:

launchctl remove com.apple.CommCenter

cd /usr/bin

chmod +x ./norz

./norz seczone.backup 0×3FA000 0×2000

chmod +x ./iUnlock

./iUnlock ./ICE03.14.08_G.fls ./eliteloader.bin

chmod +x ./bbupdater

./bbupdater -v

./bbupdater -f *.fls -e *.eep

./bbupdater -v

launchctl load -w /System/Library/LaunchDaemons/com.apple.CommCenter.plist

Step 11. Shut down the iPhone, open it on again. If you got the incorrect IMEI, please remove your SIM card and try to run Step 8-10 again. Check also from Settings > General > About. You should see 1.0.2 and 03.14.08_G. If not, please try Step 8 - 10 again.

Stage 3: Upgrade to iPhone 1.1.1.

Step 12. There are 2 methods out there. You can use AppSnapp Installer, detail guide is here. Upgrade your iPhone to 1.1.1 before you follow the guide.

Or you can use iNdependence guide by following the steps here. Start from Step 8-14. Than install anySIM from iNdependence from the Activation/SIM Tab. Run the anySIM and start to unlock now.

Where can this "anySIM 1.1.1" be found?

You can easily install in using iNdependence.