GreenPois0n RC5 tool has been updated to beta 4 and is now available to download for both Mac OS X and Windows. GreenPois0n RC5.4 could be used to jailbreak the newly released Verizon iPhone 4 which is on iOS 4.2.6 firmware. The tool is pretty easy to use and takes only little time to do the jailbreak process like the previous versions of GreenPois0n.

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Download GreenPois0n RC5.4 (beta 4) from here