Redsn0w 0.9.7b4 for iOS 4.2.1 untethered jailbreak released by Dev Team

The Dev Team has just rolled out Redsn0w 0.9.7b4, and just in case you start scratching your head and start to wonder what this release is all about, let us do our level best to summarize it for you. First of all, it will eliminate the need to install and run a separate program for usbmux, but unfortunately this fourth beta is open only to testers only. With this version of redsn0w, you are no longer required to install and run a separate program for the usbmux. Apart from that, the race condition in the user interface was also fixed, as it was long thought to cause redsn0w to crash during the “Preparing JB Monte Files” step. Bear in mind that this beta is not meant for public consumption just yet, so stay clear until all the bugs are ironed out.