These are instructions on how to downgrade your original iPhone from 2.0 to 1.1.4.
You will have to perform this tutorial if you accidentally updated to the 2.0 firmware or you just rather be on 1.1.4.
To follow this tutorial you will need to have iLiberty (Windows, Mac), iTunes 7.5 (Windows, Mac), and the 1.1.4 firmware.
Step One
If you have Windows, uninstall iTunes 7.7 and then reboot your computer.
If you have Mac OS X, open Terminal from Applications:Utilities. Enter the following commands into the Terminal window:
defaults write com.apple.iTunes StoreActivationMode -boolean NO
defaults write com.apple.iTunes StoreGeniusMode -boolean NO
killall iTunesHelper
rm -r /Applications/iTunes.app
rm -r /Library/Receipts/iTunesX.pkg
rm ~/Library/Preferences/com.apple.iTunes*
Step Two
Install iTunes 7.5 onto your computer using the download links.
Step Three
Before attempting to launch iTunes 7.5 for the first time you need to delete or rename the iTunes folder.
Windows:
Rename the C:Documents and Settings**your user name**My DocumentsMy MusiciTunes folder to iTunes Backup.
Mac OS X:
Select the iTunes folder in your Music directory and rename it iTunes Backup. You press the Enter key to rename a file in Mac OS X
Step Four
Launch iTunes by selecting its icon in the dock
Step Five
Put your iPhone into DFU mode by following these instructions.
Step Six
iTunes will notify you that it has found an iPhone in recovery mode. Click the OK button.
Step Seven
Hold down Option and press the Restore button. If you are using Windows hold down Shift and press the Restore button.
Step Eight
Select the iPhone 1.1.4 firmware file you downloaded earlier and click the Open button.
Step Nine
Once the restore has completed you will get a 1015 error or similar.
If you get an error in the 1600s then try putting the iPhone into DFU mode and try again. You might also want to try a different USB port and restart your system and if all else fails use a different computer!
Step Ten
Now you can use your favourite unlocking method to kick your iPhone out of restore mode and unlock it.
[...] is Now Available and even if you have updated to 2.0 firmware you can downgrade to 1.1.4 by reading this tutorial and then you can use this software to unlock [...]