Jailbreak iPhone and iPod touch 3.1.2 using redsn0w 0.9

Redsn0w 0.9 is finally out of beta. redsn0w 0.9 is applicable for devices running 3.0 and 3.1.2 only.
Redsn0w does not unlock your iPhone 3GS and iPhone 3G.
It can unlock as well as jailbreak your iPhone 2G only.
iPod touch 1G , 2G and 3G can be jailbroken using redsn0w.
Note: All late model devices including iPod touch 3G, the latest 2G(8gig model) and the iPhone 3GS must undergo tethered boot.

Step1: Download redsn0w 0.9 from here
Step2: Google for the latest firmware for your device and download it.
Step3: Restore your device to the latest firmware(3.1.2 in this case).
step4: Open redsn0w and point it to the latest firmware(choose your appropriate device).
step5: For iPhone 2G(only), download the bootloaders 3.9 and 4.6 from here and
Click install cydia and then unlock.
step6: From the on screen menu, choose to install just cydia and uncheck other options.
step7: Redsn0w will now take your device into DFU mode. Just follow the onscreen instructions and you are done.
step8: for late model devices, remember to tether boot your device.

Tether boot: This means that each time your device gets reset or runs out of power, connect it to a computer and then boot it. This is applicable for late model devices only.

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