Un-tethered v. Tethered Jailbreak

KabaModern

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Mar 31, 2008
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#1
If you have any questions regarding what a Tethered or Un-tethered jailbreak means, please read this first before posting any questions.

Tethered Jailbreak:

A tethered jailbreak ONLY applies to the iPhone 3GS and not all of them.

NOTE: I received an update that some iPod Touch 2G and 3G require a tethered jailbreak, too. The serial number trick may or may not be in effect (I have not tested it), but the logic and practice is the same.

A tethered jailbreak means that once your iPhone is successfuly jailbroken with blackra1n, you'll need to connect your iPhone to your computer if you ever need to reboot your iPhone or your iPhone loses battery charge.

What you'll see when you reboot your iPhone (if you're tethered) is the iTunes and USB picture. Once you get this, simply open up blackra1n and press "Make It Ra1n." This WILL NOT re-jailbreak or restore your iPhone, all it is doing is booting back up your iPhone for you.

You will require a tethered jailbreak if you have the NEW bootrom version. The OLD iBoot version was 359.3 and the NEW version is iBoot 359.3.2. There are a few methods to check which iBoot version you have.

Method 1 (Serial Number Method):

You can get a very good idea if your iPhone requires a tethered jailbreak by looking at the 3rd, 4th and 5th numbers in your serial number. If your serial number digits are "939" OR LOWER, you're safe. If you're serial number digits are "940" or HIGHER, you run a high chance that your iPhone will require a tethered jailbreak.

Some people are reporting that they've been able to successfuly jailbreak without having a tethered jailbreak with a serial number of 940 and higher. While this is rare, it apparently is happening.

Method 2 (Using DFU Mode):

Windows:

1. Put your iPhone into DFU Mode
2. Right Click on My Computer > Properties > Hardware (tab) > Device Manager
3. Select the plus arrow for "Universal Serial Bus (USB) Controller"
4. Find "Apple Mobile Device USB Driver", right click and select Properties
5. Go to "Details" and find "Device Instance ID"
6. Scroll through the string and you'll eventually find the bootrom version (iBoot)
7. If it's 359.3 you DO NOT require a tethered jailbreak. If it's 359.3.2 you DO require a tethered jailbreak.

Mac:

1. Put your iPhone into DFU Mode
2. Open "System Profiler" and go to Hardware > USB (menu on left)
3. At the top right under “USB Device Tree Panel” click “Apple Mobile Device (DFU Mode)”
4. In the upper right corner look for the information “string on the Serial Number.”
5. At the bottom you will find the description BootRom version (iBoot).
6. If it's 359.3 you DO NOT require a tethered jailbreak. If it's 359.3.2 you DO require a tethered jailbreak.



Un-tethered Jailbreak:

This is naturally quite the opposite. You have an untethered jailbreak if you reboot your iPhone with no issues.


If you have any questions, please post them here or re-read this thoroughly before starting a new thread.

:)
 

DocRawk

New Member
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Jun 11, 2009
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#3
Question for future reference:

Can Apple update your iBoot via a software upgrade? In other words, if I later update to a stock 3.2 or whatever version is next, will I risk updating the iBoot and screwing myself out of an untethered JB in the future?
 

KabaModern

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Mar 31, 2008
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#4
Question for future reference:

Can Apple update your iBoot via a software upgrade? In other words, if I later update to a stock 3.2 or whatever version is next, will I risk updating the iBoot and screwing myself out of an untethered JB in the future?
Absolutely not. The bootrom is a physical piece of the iPhone and cannot be accessed through iTunes.
 
Jun 12, 2009
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#6
your pretty useful around the forum, in other words, thanks, good thing i have a 3g..an my serial number is 942....

muahahahahaha >:)
 

snurblet

Member
Bronze
Apr 16, 2009
298
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#8
Good idea.

I put off updating from 3.0 because I was happy enough with the FW not to bother digging through the posts about this scary new thethered JB dealio.

I figured it out a few days ago, but belated thanks anyway. :)
 
Dec 12, 2009
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#9
unlock problem

I attempted to unlock my iPhone 3g 8gb on Dec 8th with blackrain and I can get it to show tmobile reception but it will not dial out or receive calls or texts..

I read on cydia that on the December 8th iTunes update may make the iPhone unlockable.

Is anyone familiar with this problem?

I hope to solve this ASAP, I have started tmobile service already and the phone is not working at all.

thank you
 

Krunk83

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Jun 28, 2008
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#10
I attempted to unlock my iPhone 3g 8gb on Dec 8th with blackrain and I can get it to show tmobile reception but it will not dial out or receive calls or texts..

I read on cydia that on the December 8th iTunes update may make the iPhone unlockable.

Is anyone familiar with this problem?

I hope to solve this ASAP, I have started tmobile service already and the phone is not working at all.

thank you
This has nothing to do with tethered or untethered jailbreak. Please stay on topic.
 

Krunk83

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Jun 28, 2008
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#16
Oh I thought you were joking at first. lol

DFU Mode = Hold down home and power button, when you see the Apple logo release the power button but continue to hold the home button. You'll get the iTunes + USB cord picture, you're in DFU Mode.
OK, I knew that but do it when I run blackra1n?