Update #4: redsn0w has been updated to 0.9.6rc19 to include changes in the way custom bundles are handled. Now when you use a custom bundle, most of the normal jailbreak steps (like stashing and untethering) are skipped. This makes it easier for custom bundles like the Verizon i4 jailbreakme fix 

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Fix bundle, depending on firmware version
4.2.6 / 4.2.7 / 4.2.8

RedSn0w 0.9.6rc19 - Windows

RedSn0w 0.9.6rc19 - Mac