[How-To] Jailbreak Verizon iPhone 4 on iOS 4.2.6 with GreenPois0n RC5 b4

So as it turned out, the Verizon iPhone 4 is vulnerable to Limera1n bootrom based exploit, and untethered GreenPois0n kernel based exploit which makes it possible to jailbreak on iOS 4.2.6, untethered using GreenPois0n RC5.4.

[How-To] Untethered Jailbreak for iOS 4.2.1 using GreenPoison RC5 b2 *UPDATE*

Update 2 : Version RC5 b2 released !

Update : Now Windows version is out !!

Chronic Dev Team has finally released the much awaited GreenPois0n RC5 which brings full untethered iOS 4.2.1 jailbreak for all iOS devices. Unlike Redsn0w 0.9.7, GreenPois0n RC5 doesn’t require you to have SHSH blobs of 4.2b3 saved on Cydia. You can jailbreak any iOS device out of the box on iOS 4.2.1 using this latest version of GreenPois0n.

iPhone | How to Update Your iPhone 4 Without Upgrading the Baseband (Windows) 4.2.1

This tutorial will show you how to upgrade your iPhone 4 to iOS 4.2.1 without upgrading its baseband using TinyUmbrella for Windows.

Please Note: This ONLY Works with the iPhone 4!

Step One
Download TinyUmbrella from here Also make sure to download the iPhone 4 iOS 4.2.1 which you can findhere.

Step Two
Double click the downloaded TinyUmbrella.exe file.

iPhone | How to Unlock the iPhone 4, 3GS, 3G Using UltraSn0w

These are instructions on how to unlock the iPhone 4, iPhone 3GS, and iPhone 3G for use with any GSM cellphone carrier using UltraSn0w. This will work with the iOS 4.2.1 firmware if you are on the 06.15.00baseband.

Before you can follow these instructions you must have a jailbroken iPhone and you must be on the 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00, or 01.59 baseband(modem firmware).

To find your firmware and modem firmware(baseband) versions you can follow this tutorial.

If you are on T-Mobile remember to turn off 3G before starting…

[How-To] Untethered Jailbreak for iOS 4.2.1 using GreenPoison RC5

Update : Now Windows version is out !!

Chronic Dev Team has finally released the much awaited GreenPois0n RC5 which brings full untethered iOS 4.2.1 jailbreak for all iOS devices. Unlike Redsn0w 0.9.7, GreenPois0n RC5 doesn’t require you to have SHSH blobs of 4.2b3 saved on Cydia. You can jailbreak any iOS device out of the box on iOS 4.2.1 using this latest version of GreenPois0n.

[How-To] Downgrade Firmware 4.2.1 to 4.1, 4.0.x on iPhone 4, 3GS, iPad, iPod touch

NOTE: This guide will only work if you have SHSH blobs saved for the respective firmware you downgrading to.

Step 1: Download the required old ipsw firmware files.

iPhone | How to Jailbreak Your iPhone 4 Using RedSn0w (Mac) [4.2.1]

These are instructions on how to jailbreak your iPhone 4 on the 4.2.1 firmware using RedSn0w for Mac. You will only be able to perform a tethered jailbreak at this time. This means you will need Redsn0w’s assistance to boot into your jailbroken device.

If you want to jailbreak a lower firmware version you can find the appropriate tutorial here.

Make sure not to update to iOS 4.2.1 if you need an unlock as one is not yet available!

Step One
Create a folder on your desktop called Pwnage

Download RedSn0w from here and place it in the Pwnage folder. Likewise, download the latest 4.2.1 firmware from below and place it in the same folder.

4.2.1 (4): iPhone3,1_4.2.1_8C148_Restore.ipsw

iPhone | How to Untether Your iOS Jailbreak (Mac) [4.2.1]

These are instructions on how to untether your jailbreak of iOS 4.2.1 using the iPhone Dev-Team’s ‘backup plan’ method on Mac OS X.

Currently this beta is limited to iPhone4, iPad, and iPod touch 4G. Bluetooth functionality is disabled for the time being until some issues are resolved.

Requirements:
You will need to have access to the iOS 4.2b3 ipsw and your iOS 4.2b3 SHSH blobs saved. You also already need to be jailbroken on iOS 4.2.1. MAKE SURE YOU BACKUP BEFORE ATTEMPTING THIS AS IT IS A BETA!

Step One
Create a folder called Pwnage on your desktop and in it place:
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[How-To] Untethered Jailbreak for iOS 4.2.1 with Redsn0w 0.9.7 *Update*

Update 2 : Redsn0w is updated ! Version 0.9.7 beta 6 is out !!

Redsn0w 0.9.7 Beta 6 Brings Skype Fix, Next Version Will Use 4.1 SHSH Blobs Instead Of 4.2b3 For 4.2.1 Untether

v0.9.7b6

Well the 6th beta of Redsn0w 0.9.7 has been released. This version fixes all Skype related issues which were hampering users ever since the first beta of this untethered iOS 4.2.1 jailbreak.

v0.9.7b5

The iPhone Dev Team has released yet another update to Redsn0w 0.9.7 jailbreak tool. This new version fixes all sandbox-related issues, including Bluetooth problems on an untethered iOS 4.2.1 jailbreak. Also added is an “anti-piracy plea” note as a warning for those of you who are pirating iOS 4.2 beta 3 firmware.

v0.9.7b4

Starting with this version, redsn0w no longer requires you to install and run a separate program for the usbmux (this was a non-trivial procedure for many).   It’s okay to keep that program running if you normally use it for ssh anyway.  We also think we’ve fixed a race condition in the GUI that was causing redsn0w to crash during the “Preparing JB Monte Files” step. Nothing at all has changed on the iPhone side (where the main issues are still just Bluetooth and Skype).

v0.9.7b3

The third beta is now available (testers ONLY please!).  This version extends the fix made in beta2 over to the non-GUI programs too (like the daemons that handle media content).  So now embedded videos in iTunes work.

v0.9.7b2

This version should fix all the native app crashes (including Task switcher).  That’s the only change in from beta1….Bluetooth is still disabled.

[How-To] Downgrade Firmware 4.3 to 4.2.1, 4.1, 4.0.x on iPhone 4, 3GS, iPad, iPod touch

iOS 4.3 was released earlier today for iPhone 4, 3GS, iPad, iPod touch 4G, 3G and Apple TV. So if you upgraded to iOS 4.3 beta, and now you want to downgrade back to iOS 4.2.1 or 4.1, follow the instructions posted below to downgrade iOS 4.3 on iPhone 4, 3GS, iPod touch and iPad to iOS 4.2.1, 4.1, 4.0.x.
NOTE: This guide will only work if you have SHSH blobs saved for the respective firmware you downgrading to.