How to jailbreak 4.2.1 (tethered)

[sakumaxp]

just did it and worked out... tethered...

Tethered aka super annoying haha but good job


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[Adam2k90]

Does respringing make your have to re jailbreak?? I think I will wait for a good one before getting 4.2.....

 

[iGaz]

No just turning your phone off or rebooting it. Well I say just... Lol

 

[sakumaxp]

Does respringing make your have to re jailbreak?? I think I will wait for a good one before getting 4.2.....

There are some things you install from cydia that make you reboot your device and therefore forcing you to run redsn0w again to be able to access cydia


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[emrhpeiris]

The iPhone Dev Team has just released Redsn0w 0.9.6b4 today which brings first proper jailbreak, with working Cydia and MobileSubstrate for all iOS 4.2.1 devices.

For those of you who don’t know, Redsn0w 0.9.6b4 is based on Geohot’s Limera1n bootrom exploit which has already pwned all current iOS devices for life. The only problem is that it is a tethered jailbreak, which means you will have to boot it into a “jailbroken state” on every reboot. This so called tethered or semi-tethered jailbreak condition in Redsn0w 0.9.6b4 however only applies to the new devices like: iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G. Old devices like iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (Non-MC Model) can be jailbroken-untethered right now using this latest version of Redsn0w. So until and unless Comex of Spirit and JailbreakMe fame comes up with another untethered hack for iOS 4.2.1, the jailbreak we get for the newer devices will be tethered (or semi-tethered).

NOTE: Those of you who rely on a carrier unlock MUST STAY AWAY from Redsn0w and iOS 4.2.1.

Follow the step by step instructions posted below to jailbreak iOS 4.2.1 with Redsn0w 0.9.6b4:

Step 1: Download iOS 4.2.1 for your version of iOS device.

Step 2: Update/Restore to iOS 4.2.1 firmware using the IPSW file you just downloaded via iTunes 10.1.

Step 3: Start Redsn0w 0.9.6b4 and point it to iOS 4.2.1 firmware to proceed with the jailbreak.

Step 4: Now select “Install Cydia” and click “Next”. Optionally (if available), you can also select any other option you like.

Step 5: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

At this stage you will be presented with a screen where you will have to quickly hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

Step 6: Sit back and enjoy while redsn0w will do all the rest for you. Once done, your iPhone or iPod touch will restart automatically and you will find it jailbroken on the latest iOS 4.2.1 firmware.

For iPhone 4, 3GS (New Bootrom), iPod touch 4G / 3G / 2G, iPad ONLY:

Step 7: Now from here onwards, whenever you want to do anything related to jailbreak like SSHing into your device, or running Cydia, you must first run your device in the so called “jailbroken state” on every reboot by using “Just boot tethered right now” option in Redsn0w.

Redsnow-Windows-Link

Redsnow-Mac-Link

in bad thing is here we have to do "tethered" option inredsn0w every time when is reboot the divice

any solution for this ?

 

[iGaz]

Not yet. Just be patient. The devs are working on it as we speak...

 

[sevenlightyears]

who cares about unlock we dont need unlock we have sim free iphones or are happy with the carrier its locked to

but with out jailbreak you have no unlock any way so the jb is just as important for you to have.

True, but I bet $1, that there are more people who need UNLOCKY more then who need jailbreak.

your probably right, the amount of countries still have iphones locked to a single carrier...





though i updated about a week ago i was using the 4.2 gm and then the 4.2.1 so i dont need jailbreak and am happy to go with out it.

+ with out jailbreak how will you unlock? remind me where is it you find your unlock tool? lol

HELP ! how did u do tht ? I'm actually using a unlock ip4 4.0 . .
but mistakenly updated it to 4.2 .. and now its lock ! omg !!
I only can use for emergency call .. pls help ..

 

[iGaz]

You need to activate it with a sim the phone is locked to. There is no unlock for 4.2 as yet...

 

[al_dantas]

can't wait to get my iphone upgraded!

Thanks!

Andre

 

[sevenlightyears]

You need to activate it with a sim the phone is locked to. There is no unlock for 4.2 as yet...

so is tht means .. i can activate it and I can log in the menu .. but cannot use the phone mode ??

 

[iGaz]

You need to activate it with a sim the phone is locked to. There is no unlock for 4.2 as yet...

so is tht means .. i can activate it and I can log in the menu .. but cannot use the phone mode ??

If you use the correct sim you can use the phone as you would normaly. If you use the correct sim just to activate it then you can use the phone except from the phone part. You would basically have an iPod touch...

 

[DannyBoy]

I have still got iOS 4.1 jailbroken with Limera1n baseband 02.10.04! If I upgrade to iOS 4.2 will be able to jailbreak my iPhone 4 with Limera1n again or Greenp0ison and will Limera1n and Greenp0ison be UNTETHERD? or is their another jailbreak for iOS 4.2? I am not interested in unlocking.

No, you havetoo use RedsnOw and it it a tethered JB.

 

[TrUSP33D]

SO BASICALLY YOU HAVE TO HOOK YOUR Idevice BACK ON YOUR COMPUTER IF YOU NEED TO RESTART IT??

 

[chazzw]

SO BASICALLY YOU HAVE TO HOOK YOUR Idevice BACK ON YOUR COMPUTER IF YOU NEED TO RESTART IT??

Can people not read?

IM going to give the JB a go... if the "Tethered" causes me isssues then ill simply restore and wait.

 

[Cuddles]

ok noob question what does it mean its tethered???