DOWNLOAD section:

For MAC users:
http://www.mediafire.com/?vv5jvmcpiyrr2p6
For Win users:
http://www.mediafire.com/?a891j0muajd4550

HOW TO:

NOTE: the process is identical on both Mac OSX and Windows, and also identical with previous redsn0w releases. The images used in this tutorial are from previous redsn0w tutorial, so do not be alarmed.

1. Restore your device with a stock iOS 4.2.1 firmware. ( again, by doing this you will loose the ability to unlock!!!)

2. Run redsn0w, and click on browse. Browse for the stock iOS 4.2.1 and open it

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3. Wait for redsn0w to recognize it and click ‘Next’

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4. On the next screen select what you want to be installed on your iOS device(s). By default, Cydia and ‘enable battery percentage’ is selected. I suggest you deselect battery percentage and everything else, and just install Cydia. This will improve ( a bit ) the overall speed of your device – if you are on a iPhone 3G. If you choose to “Enable battery percentage”, you actually toggle that off and on via Settings->General->Usage.

IF you only need to restore with a custom firmware, deselect everything, and select only “Just enter pwned DFU mode right now”

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5. redsn0w will ask you to turn your device off. If it’s not already off, plug it in FIRST and then turn it off. Click next to continue

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6. Now, you will need to put your device in DFU mode. Follow the instructions on the screen.

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7. Wait a few seconds for redsn0w to do its thing, and you are done. You can close redsn0w because everything else it’s happening directly on the device.

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NOTE: Any Windows users seeing “Waiting for reboot” for too long (more than 20 seconds or so), please try “shaking” the JB process by unplugging then replugging your USB cable (while letting redsn0w continue to run). Also, try using a USB port “closer” to your computer (as opposed to on your monitor or behind another hub).