Method For Re-Enabling DFU Mode In OS X 10.5.6 Found
For many Mac users, the OS X 10.5.6 update broke their ability to pwn their iPhone or iPod touch. If you’re one of them, then not to worry. A fix has been found that will get you hacking again in no time. It involves an Automator script and a few simple steps. However, bear in mind that this method alters kernel extensions which could potentially render your Mac inoperable. Proceed at your own risk!
To start, log in to your Mac with administrator privileges, providing the administrator password when asked. Then just follow the following steps, as follows. You can get the script at Rapidshare or Mediafire.