“@MuscleNerd: redsn0w 0.9.8b2
Dev-Team Blog - redsn0w iOS5beta should fix 50b3 App Store issue (if you're already JB, just use this to boot tethered)”
Update #2:*We’ve update redsn0w to account for the sandbox changes that affected App Store apps in 5.0b3 (and it now recognizes the IPSWs for all three betas so far). *If you already jailbroke 5.0b3 using the previous redsn0w, you don’t need to re-jailbreak…just use this updated version to boot tethered. *Start pointing redsn0w at the 5.0b3 IPSW*starting with 5.0b3.