HOW TO UNTETHERED JAILBREAK WITH REDSN0W 0.9.15B2

Just recently the Dev-Team released redsn0w 0.9.15b1 to tether jailbreak pre-A5 devices like iPhone 4 and 3GS running iOS6.
However the team released an update to the redsn0w 0.9.15b1 tool to 0.9.15b2.
This new updated redsn0w tool is packed with a good number of fixes and improvements. The most salient point being that it can now untether jailbreak iPhone 3GS with old boot rom.
So if you have a 3GS iPhone with old Boot rom, then you will be more than glad to know that your device can be jailbroken untethered on iOS6.
There is no untethered support for iPhone 4 yet but we believe that in the near future, it will be available.
Below is the step by step guide of using the new updated redsn0w to untether jailbreak your device.

Note: This tutorial assume that you are already jailbroken tethered on the device before. If not, read my other post on how to jailbreak your device with redsn0w 0.9.15b1.

Furthermore, to know if you have a old bot rom 3GS, do the following

• Download iTools and run it. plug in your device into the computer, iTools will detect your phone.
• Look for Serial Number on the Right side of  the page. if the week displayed is below week 40 then you are clearly on old boot rom.

Alternatively, do this method to double check and be 100% sure

• Launch Redsn0w 0.9.15b2 and put your device in DFU mode
• click on Extras, click on Even more and the finally click on Identity
• Look for iBoot, might be under Serial Number or Firmware Version section 
• If  your iBoot number is 359.3, you have a old boot rom, but if you have 359.3.2 or above, then you have a new boot rom. iPhone 3GS from November 2009 is new boot rom and any 3GS before November is usually thought of as old boot rom.

NEEDED ITEMS

• Redsn0w 0.9.15b2
• iPhone 3GS old boot rom
• Good functioning cables

STEPS

1. Download Redsn0w 0.9.15b2 from here http://www.idownloadblog.com/iphone-downloads/
2. Connect your iPhone 3GS old boot rom device to your computer.
3. place your device in DFU mode and then click on Jailbreak

Once Redsn0w finish jailbreaking your device, it will boot automatically and you will have a fully functioning iPhone 3GS running untethered jailbreak.

Also, the new updated Redsn0w allows you to also downgrade your device from one baseband to another baseband or same baseband provided you have your shsh blobs saved either locally with tiny umbrella or via Cydia. Especially for those that have flashed their 3GS with iPad baseband.
I will be making a tutorial on that soon, so stay tuned.

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