The redsn0w 0.9.7 b4 has been released by the Dev Team. Redsn0w 0.9.7 b4 is also a testing stage version which would test the embedded usbmuxd, for those Mac users who couldn’t get the python script running. Be careful during the untethered jailbreak process with Redsn0w 0.9.7 b4. With Redsn0w 0.9.7 b4, it no longer requires you to install and run a separate program for the usbmuxd.
Redsn0w 0.0.7 b4 also fixes a race condition in the GUI that was causing redsn0w to crash during the “Preparing JB Monte Files” step.
As this is also in a testing stage, it is only available for the Mac users at the moment.
Download Redsn0w 0.9.7 b4 for Mac from here