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HOW TO: Boot Your Tethered Jailbroken iPhone/iPod Touch Running iOS 4.2.1 [Mac]

The iPhone DevTeam 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”.

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

This is surely something new for most users, and the process can easily scare you at a first look, but we assure you it’s a piece of cake. So let’s see how to boot your tethered jailbroken iPhone running iOS 4.2.1

HOW TO: Boot Your Tethered Jailbroken iPhone Running iOS 4.2.1

1. Download redsn0w 0.9.6rc7 and the firmware for your device on the desktop

2. Load terminal app ( Applications>Utilities folder )

3. In the terminal shell, type:

open /Users/murdaFSM/Desktop/redsn0w_mac_0.9.6rc7/ –args -j -i /Users/murdaFSM/Desktop/iPhone1,2_4.2.1_8C148_Restore.ipsw

NOTE: change the filename of the .ipsw you are using to the .ipsw you downloaded for your device

NOTE: for iPod Touch 2G and iPhone 3Gs with old bootroom input the following command line:

open /Users/murdaFSM/Desktop/redsn0w_mac_0.9.6rc7/ –args -j -o -i /Users/murdaFSM/Desktop/iPhone1,2_4.2.1_8C148_Restore.ipsw

NOTE: The easiest way to make sure you got the right path to and the .ipsw file is to drag and drop into the terminal shell the files. For example:

open –args -j -i drag_and_drop_ipsw_file

NOTE: please remember to change the permissions of your custom *.command files to allow execution

NOTE: To add bootlogos to your device you need to input the following command line:

open /Users/murdaFSM/Desktop/redsn0w_mac_0.9.6rc7/ –args -j -o -i /Users/murdaFSM/Desktop/iPhone1,2_4.2.1_8C148_Restore.ipsw -b /Users/murdaFSM/Desktop/bootlogo.png ( assuming that your custom boot logo is located on desktop )

NOTE: make sure you read what every argument means before applying them on your device. For example ‘-o’ is just for old-bootrom iPod touch 2G and iPhone 3GS. Do not input that argument on any other device, or you will get stuck in a boot loop. The commands above are just an example, and not meant to be copy-pasted. They are not universal.

4. Now, redsn0w will launch. Wait for a second and allow it do do it’s thing…

5. Make sure your device is turned off and plugged in. Click next…

6. redsn0w will instruct you to put your device in DFU mode

7. Done

Also check out our Windows tutorial…