updated 12:00 pm EDT, Tue June 22, 2010
More devices may be supported later
The unofficial iPhone Dev Team has released a new beta of redsn0w, 0.9.5b5-3. The tool lets users jailbreak an Apple handheld in order to install unofficial apps, or customize iOS in greater depth. The updated release is designed to hack the final iOS 4 firmware, which became available Monday. Some limitations exist however, namely device support, since only the iPhone 3G and second-generation iPod touch are currently supported.
Because the release is in beta, the Dev Team also comments that people will need to let Cydia -- an app distribution system -- "reorganize, reload, and update" afterward. Future releases of redsn0w should support a broader range of devices, though these are unspecified so far. Different editions of redsn0w 0.9.5b5-3 are available for Intel Macs and Windows.