Untethered Jailbreak iOS 5.1 on your iDevice your iPhone 3Gs

As you may know, the processors of old-bootrom iPhone 3Gs have the chance to have an untethered jailbreak iOS 5.1 above all others! Indeed, there are two types of iPhone 3Gs, the old-bootrom and New bootrom.
A little vocabulary:
"The Bootrom (or iBoot) is part of the iPhone / iPod Touch that allows booting a firmware, and thus the start of the iPhone or iPod touch. The jailbreak is also the iBoot to hack it to do so start the iPhone / iPod Touch after jailbreak. Since September 2009, Apple introduced a new iBoot in the iPhone 3G and iPod Touch. On it, the loophole for the restart of the device is no longer possible.
So if you have a New bootrom, the jailbreak iOS 5.1 is tethered like everyone (until pod2g finds a flaw), and if you have an old-bootrom, you untethered jailbreak is.

Spend, living in the subject. To see if your iPhone 3Gs is old or new bootrom, download iDetector:

Download JailbreakFAQ
Uploading of iH8sn0w
Download on MediaFire
Once downloaded, run it.

You must now go into DFU mode:
 jailbreak iOS 5.1 is tethered

Press 3 seconds on the "Power" button on your iDevice, then without releasing the "Power" button press "Home" button for 10 seconds. Then release the "Power" button but keep pressing "Home" for 15 seconds. Your iPhone3Gs is in DFU mode.
Once your iPhone is in DFU, click "Is my Bootrom Old or New? "
iDetector tells you if you have an old-bootrom:

Or ... New bootrom:

To exit DFU hold on "home" and "power" simultaneously until the iPhone 3Gs restarts.
You are now set on the nature of your jailbreak IOS 5.1 (am untethered, tethered sub) so you can follow these tutorials:

Unlock your iPhone for all Baseband free in this link 
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Tags : iPhone 5   Unlock Jailbreak   iOS 5   iPhone to iTunes   HTC   iPad Apple      
Motorola Tablet   Jailbreak iPhone 3G   Apple TV 2G    Siri    Redsn0w    Untethered jailbreak
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