Press Power OFF button and enter into the DFU mode. At this point you need to check Install Cydia option and proceed.Ħ. If you have pointed it to the correct file, it will show something as given above. Open Redsn0w and point it to the downloaded iOS 4.2.1 ipsw file. Download Redsn0w 0.9.6 b4 for Windows or Mac from Hotfile here.ģ. Download iOS 4.2 ipsw corresponding to your iPhone, iPod Touch or iPad here.Ģ. Follow our step by step guide to jailbreak iOS 4.2.1 using Redsn0w.ġ. So until someone releases a complete working untethered jailbreak for iOS 4.2, Redsn0w 0.9.6 b4 is the only option to get Cydia working in your device. However, Redsn0w 0.9.6 b4 support un-tethered jailbreak on iPhone models with old iBoot ROM and in iPod Touch 2G models. So if you are rebooting your jailbroken idevice, you should be near a PC or Mac to take it to the jailbreak mode. It is based on Geohot’s iboot exploit in Limera1n, and is a tethered jailbreak. The new Redsn0w 0.9.6 b4 enables iOS 4.2.1 jailbreak on iPhone, iPod Touch and iPad. The iPhone-Dev team today released an updated version of Redsn0w that can be used to jailbreak iOS 4.2.1.
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