How To Jailbreak iOS 4.2.1 Using Redsn0w 0.9.6rc7 (One Click Tethered) On Windows, Mac

Posted by dkszone on January 3, 2011

The iPhone Dev Team have released a new version of Redsn0w to support single click tethered jailbreak for iOS 4.2.1 on iPhone, iPod Touch, and iPad. The main purpose of this release is to remove unnecessary steps and give one step jailbreak process via command line arguments.

We’ve updated redsn0w to include “one-click” support for those of you running the tethered 4.2.1 jailbreak. Using command-line arguments, you can now bypass the screens you’d normally see as you use redsn0w to “Just boot tethered for now”.

This should help ease the pain of the tethered jailbreak until @comex comes up with a 4.2.1 untether (or for those of you with legit access to the 4.2b3 IPSW, until the “Jailbreak Monte” untether is out of beta)!

The available command line arguments are:

-j to ask redsn0w to “Just boot now tethered for now”

-i to specify your reference IPSW

-o for old-bootrom iPod touch 2G and iPhone 3GS

-b to specify your own boot logo png

Jailbreak iOS 4.2.1 Using Redsn0w 0.9.6rc7 On Mac OS X

Extract Redsn0w 0.9.6rc7 zip file contents and place ‘Redsn0w.exe’ and the shell command ‘boot-ipt4g.command’ on your desktop. Also place your iOS IPSW firmware for your iDevice on desktop.

All download links given at bottom.

Next double click on ‘boot-ipt4g-command’ to run it. This will automatically run the following command in your Mac OS X terminal:

open ~/Desktop/redsn0w.app —args -j \ ~/Desktop/iPod4,1_4.2.1_8C148_Restore.ipsw

The above command works for iPod Touch 4G on iOS 4.2.1. In order to make it work for your iPhone or iPad, right click on the command, select ‘Open With –> TextEdit’, and edit the command to reflect your current IPSW firmware.

Replace ‘iPod4,1_4.2.1_8C418_Restore.ipsw’ to the exact name of your device’s firmware.

jailbreak_4.2.1_iphone_ipad_redsn0w_mac

The above command assumes assumes that both redsn0w and the IPSW are on your OS X desktop, so modify it if you want to place them elsewhere.

When you double click the command, your Redsn0w 0.9.6rc7 will automatically skip all the steps, including selection of iOS firmware and the ‘Just booth tethered now’ option to directly take you to the screen where you are asked to put your iPhone in DFU Mode.

(Mac users: please remember to change the permissions of your custom *.command files to allow execution.)

Jailbreak iOS 4.2.1 Using Redsn0w 0.9.6rc7 On Windows

Extract the Redsn0w 0.9.6rc7 zip file and copy Redsn0w.exe, the shortcut ‘boot-ipt4g’ and your iOS IPSW firmware to C drive.

All download links given at bottom.

The shortcut ‘boot-ipt4g’ points to the following command:

C:\redsn0w.exe -j -i “C:\iPod4,1_4.2.1_8C148_Restore.ipsw”

As you can see, you are expected to place both Redsn0w.exe and your iOS IPSW firmware in your C: for this command to work.

Right click on the shortcut, select ‘Properties’ and go to the ‘Shortcut’ tab. Edit the command to reflect your current IPSW firmware. Replace ‘iPod4,1_4.2.1_8C418_Restore.ipsw’ to the exact name of your device’s firmware.

Make sure you put quotes around the file path.

jailbreak_4.2.1_iPhone_4_iPod_touch_4_ipad

When you double click the shortcut, Redsn0w will automatically process the IPSW so that you don’t have to select it manually and select the ‘Just booth tethered now’ option (the –j argument in the command). So you are directly taken to the screen where you put your device in DFU mode.

Redsn0w_0.9.6_rc7_download

Make sure you have the latest version of iTunes and also you are using a USB 2.0 port.

As with previous releases of Redsn0w, WINDOWS 7 users should run the program in XP Compatibility mode and also as an administrator should they encounter any errors.