Download Redsn0w 0.9.8b4 for Windows & Mac
Yesterday Apple has released iOS 5 beta 4 and iTunes 10.5 beta 4 to fixes numbers of bugs and improves stability and performances. If You want to upgrade iOS 5 beta 4 on iPhone 4, iPhone 3GS, iPad 2,iPad 1 and iPod Touch 3G/4G than you required to update iTunes 10.5 beta 4, after update iTunes 10.5 beta 4 be aware of that will can not supports iOS 5 beta 2, so before that please update first iOS 5 beta 2 because iOS 5 beta 3 and 4 supports iTunes 10.5 beta 4.
Unfortunately there is no Untethered jailbreak tool for iOS 5 beta 4, so you have only one way to jailbreak your device with Tethered jailbreak tool Redsn0w, which has been updated by iPhone Dev Team for Windows and Mac.
Update #4: In conjunction with iOS5 beta4 being released to iOS developers, redsn0w 0.9.8b4 is now available for jailbreak app developers (point the b4 redsn0w at the b4 IPSW). Remember, it’s a tethered jailbreak right now so you’ll need to use redsn0w to boot into a jailbroken state at each power cycle.
NOTE: It appears that by design, the OTA update that became available starting with iOS 5 beta4 will *not* be automatically applied to jailbroken devices. That’s a relief to those who don’t want to lose their jailbreak via OTA pushes. If you’re jailbroken, you’ll need to use the standard iTunes method to get to iOS 5 beta4.
Stay tune with us for more details to jailbreak iOS 5 beta 4 on your i-Devices using Redsn0w 0.9.8b4