You can create custom cooked iOS 4.1 firmware with PwnageTool 4.1 (tutorial here ) and  custom iOS 4.1 will jailbreak iOS 4.1 on iPhone 4/3GS/3G and iPod Touch 4G/3G. PwnageTool is currently available for Mac OS X only. So, only Mac users are able to create custom iOS 4.1 firmware using PwnageTool 4.1.

If you are on Windows and want to jailbreak iOS 4.1 and preserve baseband of your iPhone for unlocking. We have made custom cooked iOS 4.1 firmware for all iDevices just for you. Mod Your Pod's official custom iOS 4.1 firmwares are created with PwnageTool 4.1 and can be restored via iTunes (download links below).


You can download iOS 4.1 Custom firmware for :

* iPhone 4
* iPhone 3GS
* iPhone 3G
* iPod Touch 4G
* iPod Touch 3G

Read these before you proceed :

* The custom firmware will provide untethered jailbreak.

* There are two types of Custom Firmwares available for download below.

    o ACTIVATED: These custom IPSW files are for users who have to unlock their iPhone after jailbreak which means they are NOT on Official Carrier.
    o NOT ACTIVATED: These custom IPSW files are for users who are on Official Carrier.
 
Install Custom iOS 4.1 Firmware [How To] :
 
1) Download (all parts) of custom iOS 4.1 firmware (IPSW) for your iDevice ( links below ).

2) Join the splitted custom IPSW file by unpacking them :
          * Mac Users : Use BetterZip ( or what ever you want )
          * Windows Users : Use HJSplit ( or what ever you want)

3) Now, you will get a .IPSW custom firmware.
 
4) Put your iDevice into DFU Mode.

For DFU Mode : For DFU mode : Turn off your iDevice while still connected to your computer. Hold the home button and power button for 10 seconds, then release the power button.

5) Press the Shift key for Windows or ALT for Mac and click restore and use the custom IPSW.
 
6) It will restore your iPhone/iPod Touch and will jailbreak it.
 
7) iPhone users who want to unlock their iPhone need to install UltraSn0w, follow this guide.

Download Custom iOS 4.1 Firmware (IPSW Files) below :

iPhone 4 Custom iOS 4.1 Firmware IPSW

Activated (for Unofficial Carrier Users)
NOT Activated (for Official Carrier Users)

iPhone 3GS Custom iOS 4.1 Firmware IPSW

Activated (for Unofficial Carrier Users)
NOT Activated (for Official Carrier Users)

iPhone 3G Custom iOS 4.1 Firmware IPSW

Activated (for Unofficial Carrier Users)
NOT Activated (for Official Carrier Users)

iPod Touch 4G Custom iOS 4.1 IPSW

iPod Touch 3G Custom iOS 4.1 IPSW