The iPhone Dev Team has just updated Redsn0w 0.9.7 untethered iOS 4.2.1 jailbreak to fix bluetooth issues and any sand-box related issues. The fifth beta is now available (testers ONLY please!). Bluetooth is now working (and any sandbox-related issues should be resolved too). Please do not pirate the 4.2b3 IPSW! Only those enrolled in the iPhone [...]
