The Dev Team has released the beta 3 version of RedSn0w for the Mac and PC. This update is expected to fix an error that caused MobileSubstrate to sometimes crash on jailbroken iOS devices.
It seemed that this error crashed MobileSubstrate only when the latest iOS 5.0.1 untether in RedSn0w was run over an existing jailbreak.
For Dev Team Blog:
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).
However, if RedSn0w tells you that no identifying data was found when it auto-detects your IPSW, then you can pre-select your iOS device’s 5.0.1 IPSW in RedSnow’s Extras >Select IPSW menu.
Did you ever experience this error? Did you find this update helpful?
Source: iDownload Blog