The new version has been released on the official website of Greenpois0n RC4. This new update jailbreak tool for the signing of 4.1, currently available only for Windows and Mac, is to add support for second-generation iPod Touch. 

The jailbreak for both models of this device (MC - MB) will be untethered to type, or do not have to reconnect your iPod to your computer and rerun Greenpois0n to preserve the jailbreak. The exploit untethered implemented in this new version of the tool was discovered by Comex, while that of bootrom by Pod2g.

Download Greenpois0n RC4