Redsn0w 0.9.6 RC7/RC8 with One-Click Tethered 4.2.1 Boot Feature: Complete How-To Guide

Two versions of Redsn0w are being developed right now for iOS 4.2.1 jailbreak. Redsn0w 0.9.6 builds can jailbreak iOS 4.2.1 (tethered only) on all devices whereas Redsn0w 0.9.7 builds bring untethered jailbreak support for iOS 4.2.1 on newer devices only i.e., iPhone 4, iPod Touch 4G and iPad.

The necessary requirement for untethered jailbreak is that you have SHSH blobs for iOS 4.2 b3 saved on Cydia servers. So, if you didn’t save SHSH blobs or you have got one of old devices like iPhone 3G(S), iPod Touch 3G, you can use Redsn0w 0.9.6 rc7 to jailbreak the device and perform one-click tethered boot.

One Click tethered boot feature in Redsn0w 0.9.6RC7 allows you to skip almost all steps and you can get booted your device with single command or one click.

Here is the complete step by step how-to-do one-click tethered boot method:

For Windows Users:

Step 1: Download the Redsn0w 0.9.6 RC 1 zipped folder and extract it.

Step 2: Place Redsn0w.exe and iOS 4.2.1 IPSW file in one top-level folder just for convenience; as you can see I have placed these two files in the folder “jailbreak” on  E drive.

Step 3: If you are a Windows 7/vista user, make it sure that you run Redsn0w in compatibility mode. For this purpose right-click on Redsn0w.exe file and click on “Properties”. Go to “Compatibility” tab and check these two options:

  • Run this program in compatibility mode for:
  • Run this program as an administrator

as shown in the screenshot below.

Step 4: Open the Command Prompt and run the following commands.

To select E:\ drive, type


and press Enter.

To select jailbreak folder, type

cd jailbreak

and  press Enter.

Now type the following command

redsn0w.exe -j -i “E:\jailbreak\iPhone2,1_4.2.1_8C148a_Restore.ipsw”

And hit Enter button. See the screenshot below:

The complete command will be like this:

E:\jailbreak\redsn0w.exe -j -i “E:\jailbreak\iPhone2,1_4.2.1_8C148a_Restore.ipsw”

The other available command line arguments for Redsn0w are:

-j to ask redsn0w to “Just boot now”
-i <filename> to specify your reference IPSW
-o for old-bootrom iPod touch 2G and iPhone 3GS
-b <filename> to specify your own boot logo png

Short-Cut and If You Are Not Familiar with Command Prompt:

If you don’t know how to use command prompt or you don’t want to type those commands on every boot, you can also create a short-cut file for this purpose.

To ease the procedure we will use the shortcut file “boot-ipt4g” which you find in the redsn0w folder downloaded in Step 1. Right click on it to open the properties.

Go to “Shortcut” tab and type the exact path of Redsn0w.exe and respective iOS 4.2.1 file in the field of “Target”. As we have already placed these two files in E:\jailbreak folder, so we will use this:

E:\jailbreak\redsn0w.exe -j -i “E:\jailbreak\iPhone2,1_4.2.1_8C148a_Restore.ipsw”

Place type the correct file names and destination folders if you have changed the files names or placed these files in any other location.

Now go to “Compatibility” tab to run Redsn0w in compatibility mode. See the Step 3 for more details. You can also go to “General” tab and change the file name from “boot-ipt4g” to any name like “boot-iphone3gs” etc.

Apply the changes and save the file. Now double-click on this shortcut file to run the redsn0w without typing any commands.

For Mac Users:

To get the one-click tethered boot on Mac, type the following command, assuming that all the files are on desktop:

open ~/Desktop/ –args -j -i ~/Desktop/iPod4,1_4.2.1_8C148_Restore.ipsw

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

For best results use the latest  iTunes 10.1 version.


  • Download Redsn0w 0.9.6 RC 7 for Windows
  • Download Redsn0w 0.9.7 RC 7 for Mac
  • Official Link in case above mentioned direct links don’t work
  • Download iTunes 10.1
  • Download iOS 4.2.1 file for your iPhone

Update 1X:

Download Redsn0w 0.9.6 RC 8:

If you are using command line / shortcut method for one click tethered boot with custom bootlogo, Redsnow 0.9.6 rc8 has just been released that reports why a given PNG file for bootlogo is invalid.

Here are download links for RC8 version:

  • Download Redsn0w 0.9.6 RC8 for Windows
  • Download Redsn0w 0.9.6 RC8 for Mac
  • Link to official release page in case the above direct links don’t work for you.

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Updated 11 years agoCategorized as Jailbreak

By A. Usman

Loves new tech, especially from Apple and Google.

View all of A. Usman's posts.

1 Reply

  1. Serkankocyigitsays:

    i m using ipod touch 3g 8 GB ( MC ) i cant jailbreak my itouch with this. whenever i tried to jailbreak tethered it says ” ipod touch 2g mc model is not compatible ” i tried alll …

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