Yesterday, the Dev Team released the redsn0w 0.9.7 b1 to jailbreak iOS 4.2.1 untethered. Now, the Dev Team has updated the redsnow 0.9.7 b1 tool to version b2 to fix some issues with the untethered iOS 4.2.1 jailbreak with redsnow 0.9.7 b1. It fixes all the native app crashes including Task switcher and this is the only change made in redsn0w 0.9.7 b2.
If you had troubles with the usbmuxd while using redsnow 0.9.7 b1, then there is no use with this version. You’ll have to wait for another beta of redsnow 0.9.7.
NOTE: This is only for testers. So do it at your own risk.
Download Redsnow 0.9.7 b2 for Mac from here
Stay tuned to Tips Needed for more updates and jailbreak/unlock guides!