Redsn0w the popular tool for jailbreaking iPhone has been updated to beta 4 to support the latest iPhone OS 4.0 beta 4. iPhone OS 4.0 beta 4 was released by Apple last week, and the developer team has already been able to jailbreak the iPhone OS 4.
The latest version of Redsn0w is targeted at developers of jailbroken apps who are trying to get their apps working on the iPhone OS 4.0 platform. If you are someone who is not a developer you should stay away from this app for now.
This is a beta release of redsn0w targeted at developers of jailbroken apps. It uses the same pwnage2 DFU-mode exploit that we’ve been using since the 2.x days. Nothing new is revealed to Apple, and it’s not applicable to the iPad. Don’t go near it if you use yellowsn0w, ultrasn0w, or blacksn0w.
Redsn0w 0.9.5b4 only supports iPhone 3G for now, users will also have to use MAC OS X for the jailbreaking. Please do not use this tool if you do not have the iPhone OS 4.0 beta1/beta4 installed on your device.