Before you start, make sure that you have updated your device and created a backup so that you can restore your apps, photos, media, contacts and everything. Also unlock your device by typing the passcode if necessary.

STEP 1: Download CLI Absinthe for Windows and Mac OS X from here.

STEP 2: Unzip the folder named cinject_0.4.3 into the system folder, i.e. C:\.

STEP 3: Now go to the start menu, click on run and type in cmd.exe.

TEP 4: In the command window, type: CD C:\cinject_0.4.3 as shown to get into the required folder.

STEP 5: You’ll now need to execute CLI. Do this by typing: cinject.exe -i payloads/jailbreak.mobileconfig

STEP 6: Now execute cinject.exe -j payloads and wait for the backup.

STEP 7: Finally execute the command cinject.exe -w.

STEP 8: Get in your device and tap on Absinthe icon to get your jailbreak done in few minutes.

Errors:

• For FATAL(_LINE_) error, go to Settings > General > Reset > Erase All Content And Settings. Then do the procedure all over again.
• For Camera Roll error: You can simply fix this error by rerunning the jailbreak on the A5 device.
• For error establishing database connection : You can fix “error establishing a database connection” message by going to Settings > General > Network > VPN > ON. Now try again and you won’t receive this message.

Job done!

According to 9to5mac, the glitch will fix itself on January 3rd. You may recall a similar bug in the iOS software which was later on fixed in iOS 4.2.1. For now, make sure to set all your alarm clock to reoccur, or repeat on the days you want it to. This bug is present in 4.2.1 and earlier versions of iOS

You may need to do this to add the unofficial iPhone Dev-Team bundle that will let you create a custom ipsw for the old bootrom iPhone 3GS that won’t update your baseband when upgrading to iOS 4.2.1.

Step One

Make a folder called “Pwnage” on the desktop. Download PwnageTool 4.1.3 into the folder.

You will also need to get the minimal iPhone 3GS bundle from here. Double click to extract it to the Pwnage folder.

Step Two
Double click to mount PwnageTool then drag the PwnageTool icon into the Pwnage folder.

Step Three
Right click the extracted PwnageTool app and choose Show Package Contents from the menu that appears.

Step Four
Navigate to Contents/Resources/FirmwareBundles/

Step Five
Copy and paste the iPhone2,1_4.2.1_8C148a.bundle from the Pwnage folder on your desktop into the FirmwareBundles folder.

Step Six
You can now launch PwnageTool from the Pwnage folder on your desktop and the application will detect your new firmware bundle.

STEP 1: You will need those Cydia programs for free by tapping into Cydia from your Springboard and touch on Search then install the following apps: iRetiner, MobileTerminal, and Erica Utilities.

STEP 2: Once you install these three programs from Cydia, launch MobileTerminal on your springboard.

STEP 3: Type in the following commands in MobileTerminal:

su (then press enter)
alpine (press enter again)
iRetiner (enter once more)

STEP 4: Type 1 and then confirm the selection by typing y.

STEP 5: After the installation is complete, type y to restart the springboard!

Enjoy the new HD icons.

You will need :

1. The latest version of Cydia. (DOWNLOAD)

2. Safari Download Manager Plug-in

3. Terminal

Once you have all the above mentioned files and apps, you can proceed to installation.

Step 1 : Download the latest version of Cydia to your iPhone via Safari Download Manager from this link.

Step 2: Once the download is completed, open Terminal. and type :

login root

Step 3: Enter the password ‘alpine’.

Step 4: Type in the following command once you login as the root :

/usr/bin/dpkg -i “/var/mobile/Media.Downloads/cydia_1.0.3366-1_iphoneos-arm.deb”

Once the installation process is completed, reboot you device. Installation is complete!

STEP 2: Now, you need to download the right gold master version for your device:

• iPhone 4, get it from here.
• iPhone 3GS, download this.
• iPhone 3G, from here.
• iPod touch 4G, from here.
• iPod touch 3G, this one for you.
• iPod touch 2G, have fun with this one.
• iPad 3G and Wi-Fi, get this one.

STEP 3: Connect your iPhone into your computer via USB and iTunes hold Alt (Shift in Windows) and click on the ‘restore’ button then point it to one of the gold master files you download above. Wait for between 10 and 15 minutes for the new OS to be moved over.

Finally have fun, you can also jailbreak iOS 4.2 (not unlock) using our step by step guide posted here. Also keep in mind that iOS 4.2 should go public sometime next week, but who wants to wait? of course let us know if you faced any problems by commenting in the section below, we would love to hear from you! [Thanks Brian Sweet for making this possible]

STEP 1: Jailbreak your iPhone 3GS (if you haven’t yet) using the instructions posted here to jailbreak your iPhone 3GS on iOS 4.1 using Limera1n or GreenPois0n.

STEP 2: Install OpenSSH by opening Cydia, tap on the Search button and write down OpenSSH then install this app and reboot your device.

STEP 3: Connect your iPhone 3GS into your computer via USB and make sure that iTunes is not running.

STEP 4: Download and install Cyberduck (Mac) or WinSCP (Windows) to SHH into your device and enter the following login information to get into your iPhone:

• Hostname: The IP address of your iPhone/iPad/iPod touch. Setting –> WiFi –> “Your Network Name”
• User name: root
• Password: alpine
• Protocol: SFTP in case you running Mac or SCP for Windows.

STEP 5: Download the pre-edited file HDVideo3GS.zip.

STEP 6: Now copy N88AP.plist file to /System/Library/CoreServices/SpringBoard.app/

STEP 7: Now copy the other 3 ,plist files to /System/Library/PrivateFrameworks/Celestial.framework/N88/

STEP 8: Almost finished! Now simply reboot your device and enjoy the trick!

Final Result :

Step One
Open your web browser of choice and navigate to http://www.greenpois0n.com. Click the Mac link at the bottom of the screen.

Step Two
When prompted save the download to your desktop

Step Three
Double click the downloaded gp_mac_rc3.zip file to extract the archive then double click greenpois0n from the desktop to launch the application

Step Four
Connect your iPad to the computer, power it off, then click the large Jailbreak button

Step Five
You will now be instructed on how to place your iPad into DFU mode. You can get help with this here.

You will be asked to press and hold the sleep button for 3 seconds.

Continue holding sleep; press and hold home for 10 seconds.

Release sleep button; continue holding home for 15 seconds.

Step Six
Once your iPad is successfully in DFU mode the jailbreak will begin.

Step Seven
Click the Complete button once the software application has completed.

You’ll notice some verbose mode text scrolling on your device.

Step Eight
After the iPad restarts you’ll have a new Loader application on your Springboard. Press to launch it.

Step Nine
Press to select Cydia then press the large Install Cydia button that appears.

Step Ten
Once Cydia has installed successfully you will be asked if you want to remove Loader from your device. Press the Remove button then press the Home button. Your device will now automatically reboot.

Step Eleven
When your iPad has restarted you can run Cydia. Let it do all the necessary updates.

These are instructions on how to jailbreak your iPhone 3GS and iPhone 4 using Greenpois0n for Mac. Greenpois0n only supports iOS 4.1 firmware.

Step One
Open your web browser of choice and navigate to http://www.greenpois0n.com. Click the Mac link at the bottom of the screen.

Step Two
When prompted save the download to your desktop

Step Three
Double click the downloaded gp_mac_rc3.zip file to extract the archive then double click greenpois0n from the desktop to launch the application.

Step Four
Connect your iPhone to the computer, power it off, then click the large Jailbreak button.

Step Five
You will now be instructed on how to place your iPhone into DFU mode. You can get help with this here.

You will be asked to press and hold the sleep button for 3 seconds.

Continue holding sleep; press and hold home for 10 seconds.

Release sleep button; continue holding home for 15 seconds.

Step Six
Once your iPhone is successfully in DFU mode the jailbreak will begin.

Step Seven
Click the Complete button once the software application has completed.

You’ll notice some verbose mode text scrolling on your device.

Step Eight
After the iPhone restarts you’ll notice a new Loader application on your Springboard. Press to launch it.

Step Nine
Press to select Cydia then press the large Install Cydia button that appears.

Step Ten
Once Cydia has installed successfully you will be asked if you want to remove Loader from your device. Press the Remove button then press the Home button. Your device will now automatically reboot.

Step Eleven
When your iPhone has restarted you can run Cydia. Let it do all the necessary updates.