jailbroken 4.2.1 by redsn0w with a 6.15.00 Baseband

Heres what I did:

Jailbroke Iphone via redsn0w

Opened Itunes 9.0.3

Opened mughalGs Iphone Unlocker IPhone Unlocker 4 BB 6.15 [nowifi].rar

Clicked Get it

Reset phone 2 times

and DONE!

For those that not get to work.
=======================
Download ifunbox
connect your iphone and open ifunbox.

click on "Rawfile system"
open VAR
open root
open media

If it is empty..make new folder.named"Cydia"
open Cydia ..
IN "cydia" folder make another folder named:AutoInstall"
IN :AutoInstall" folder past ultrasn0w files(First extrac it then Past)
REboot 2 time..
ENjoy

The ultra sn0w files are here:
ulrasn0w.6.15 by zain.rar - 4shared.com - online file sharing and storage - download


UPdated
Iphone Unlocker NoWifi V 1.1 beta by MughalG

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Iphone unlocker [NoWifi] has been updated to support latest Itune versions.

Whats New:

* Supports all Itune versions
* Ultrasn0w updated to latest version 1.2.3 to support firmware upto 4.3.3

Download link:

IPhoneUnlocker.rar

As you know that Apple has released iOS 4.3.5 to fix security issue. The good news is that some guys have confirmed that current Redsn0w version can jailbreak 4.3.5 iPhone 4, 3GS, iPod Touch 4G, 3G, iPad 1.

As we reported you that this jailbreak is still tethered jailbreak which means that you will need to reconnect your iDevice with computer every time your reboot iDevice.

[h=2]Jailbreak 4.3.5 iPhone 4, 3GS, iPod Touch 4G, 3G, iPad:[/h]

Step 1: Download iOS 4.3.5 and iOS 4.3.4 (required by this version of Redsn0w) firmware file for your device from the links given at the end.

Step 2: Download Redsn0w 0.9.8b4 for Windows or Mac. Also make sure you are running the latest version of iTunes, which is version 10.4.

Step 3: Now start Redsn0w, browse for the iOS 4.3.4 firmware file (NOT the 4.3.5) that you downloaded in Step 1 and point it towards Redsn0w. Refer to the screenshots below:

Step 4: Once Redsn0w is done recognizing the firmware file, click Next and there you’ll be taken to a new window. Simply check the “Install Cydia” box as shown below and leave other options as it is for now. Once done, click Next.

Step 5: On this screen, Redsn0w will instruct you to power down your device and plug it in to your computer. Follow the onscreen instructions and then click Next to continue.

Step 6: On this screen you will have to put your device in DFU mode with a combination of the Power button and the Home button for a certain amount of time, simply follow the onscreen instructions on how to do so. The combination is usually like this:

• Hold down Power button for 5 seconds.
• Now without releasing the Power button, hold down the Home button simultaneously with the Power button for 10 seconds.
• Let go of the Power button but keep on holding the Home button for another 15 seconds.

If you performed the above mentioned steps correctly, then your device should be in DFU mode.

Step 7: Redsn0w will now jailbreak your device, don’t do anything weird at this point, just let Redsn0w finish. We would recommend that you don’t do anything with your PC or Mac at all during the process. Sitting idle and waiting for the process to end on its own is much advised.

Since this is a tethered jailbreak, therefore whenever your iOS device loses power, it will go into the dreaded Apple logo boot screen loop. To get out of that, simply start from Step 3 again and in Step 4, uncheck “Install Cydia” and instead check “Just boot tethered right now” option and hit “Next” with your iPhone, iPad or iPod touch connected to your PC or Mac. And yes, you will have to do this every time when your device reboots or loses power.

That’s it! You should now have a jailbroken iPhone, iPad, or iPod touch running iOS 4.3.5.

Downgrade 5.0.1 to 4.3.3 / 4.3.5 - Requirement :

Before we show you how to downgrade 5.0.1 to 4.3.3 / 4.3.5 or any iOS version please keep in mind that you can only downgrade your iOS version only if you have saved your SHSH blobs (for the older iOS version) using either Cydia or TinyUmbrella (or even the “copy from /tmp during restore” method for advanced users).

iPhone 4S downgrade still not available as it cant be jailbroken so far.

How to downgrade 5.0.1 to 4.3.3 / 4.3.5 - iPhone 4, 3GS, iPod Touch 4G, 3G, iPad:

Step 1: Make sure that you have downloaded the version of iOS which you gonna downgrade to (4.3.5, 4.3.3 or any iOS version), you can download any iOS firmware from our library -

Step 2: Navigate to :
Windows Users: Windows > System 32 > drivers > etc
Mac Users : etc

Open hosts file with the text editor then add the following code to the end of the file :

74.208.105.171 gs.apple.com

Alternatively: Use TinyUmbrella to make iTunes look at Cydias Server in the Advanced options.

Step 3: Plug your iOS device and switch it off

Step 4: Put your iOS device in DFU mode (If you dont know how to put your device in DFU mode )

Step 5: Select the firmware you gonna downgrade to manually to restore your deice. (Shift on Windows, and option on a Mac)

iTunes will till you that it will talk to Apple servers but actually it will talk to Cydia servers.

Step 6: You may receive 10xx error, but dont worry, this is normal and has a quick fix - to fix such errors.

Now you have successfully downgrade iOS 5.0.1 to 4.3.3 / 4.3.5 , but in case you found any problems doing this, please let us know om the comment section.