After releasing Redsn0w 0.9.10b1 to support untethered iOS 5.0.1 jailbreak, iPhone dev team has released two other beta versions of tool continuously to fix some bugs for untethered jailbreak for supported devices including iPhone 4, 3GS, iPod Touch 4G, 3G and iPad.
Official words about Redsn0w 0.9.10b3:
“The b3 version of redsn0w fixes a problem where re-running redsn0w over an existing jailbreak would cause MobileSubstrate-based apps to stop running until MS was installed again. Now you can re-run the redsn0w jailbreak step without worrying about that (but still remember to de-select the “Install Cydia” option if it’s already installed).”
You can download the latest Redsn0w 0.9.10b3 through links below.