How to Downgrade Your iPhone 3GS From iOS 6.x to iOS 5.x (Mac)

These are instructions on how to downgrade your iPhone 3GS from iOS 6.x to iOS 5.x using saved SHSH blobs and Redsn0w for Mac.

Step One

Create a folder on your desktop called Pwnage

Download the latest version of RedSn0w from here and place it in the Pwnage folder. Likewise, download the firmware you would like to restore to and the firmware you are current on from here and place it/them in the Pwnage folder. 

Extract the RedSn0w zip file by double clicking it.

Step Two

Right click or control-click the redsn0w application from the redsn0w folder we extracted earlier and chooseOpen from the popup menu that appears.

Step Three

Click Extras from the main menu.

Step Four

Click Even More from the Extras menu.

Step Five

Click Restore from the Even More menu.

Step Six

Click IPSW from the Restore menu, choose the IPSW you would like to restore to from the window that appears, and click Open.

Step Seven

Redsn0w will ask you if you would like to prevent the baseband from being updated. Click Yes.

Step Eight

Redsn0w will inform you that Pwned DFU mode is needed to restore. Click the OK button.

Step Nine

Connect your device, turn it off, and then click the Next button

Step Ten

RedSn0w will now guide you through the steps to get into DFU mode.

Hold down both the Home button and the Power button for 10 seconds.

Release the Power button and continue holding the Home button until RedSn0w detects the device.

Step Eleven

Your iPhone will now be exploited with limera1n.

Step Twelve

RedSn0w will check Cydia to see if you have the correct blobs saved.

If RedSn0w is unable to find your blobs automatically you can try to click the Remote button to try again or you can click the Local button to search for blobs on your computer.

Step Thirteen

RedSn0w will now prepare a system restore image.

Step Fourteen

Your device will then be restored to the new firmware.

Step Fifteen

You'll be informed when your restore has completed successfully. 

How to Downgrade Your iPhone 4 From iOS 6.x to iOS 5.x (Mac)

These are instructions on how to downgrade your iPhone 4 from iOS 6.x to iOS 5.x using saved SHSH blobsand Redsn0w for Mac.

Step One

Create a folder on your desktop called Pwnage

Download the latest version of RedSn0w from here and place it in the Pwnage folder. Likewise, download the firmware you would like to restore to and the firmware you are current on from here and place it/them in the Pwnage folder. 

Extract the RedSn0w zip file by double clicking it.

Step Two

Right click or control-click the redsn0w application from the redsn0w folder we extracted earlier and choose Open from the popup menu that appears.

Step Three

Click Extras from the main menu.

Step Four

Click Even More from the Extras menu.

Step Five

Click Restore from the Even More menu.

Step Six

Click IPSW from the Restore menu, choose the IPSW you would like to restore to from the window that appears, and click Open.

Step Seven

Redsn0w will ask you if you would like to prevent the baseband from being updated. Click Yes.

Step Eight

Redsn0w will inform you that Pwned DFU mode is needed to restore. Click the OK button.

Step Nine

Connect your device, turn it off, and then click the Next button

Step Ten

RedSn0w will now guide you through the steps to get into DFU mode.

Hold down both the Home button and the Power button for 10 seconds.

Release the Power button and continue holding the Home button until RedSn0w detects the device.

Step Eleven

Your iPhone will now be exploited with limera1n.

Step Twelve

RedSn0w will check Cydia to see if you have the correct blobs saved.

If RedSn0w is unable to find your blobs automatically you can try to click the Remote button to try again or you can click the Local button to search for blobs on your computer.

Step Thirteen

RedSn0w will now prepare a system restore image.

Step Fourteen

You device will then be restored to the new firmware.

Step Fifteen

You'll be informed when your restore has completed successfully. 

How to Tether Jailbreak Your iPhone 3GS Using RedSn0w (Mac) [6.0]

These are instructions on how to perform a jailbreak of your iPhone 3GS on iOS 6 using Redsn0w for Mac.

This jailbreak is untethered for old bootrom devices; however, new bootrom devices are tethered. A tethered jailbreak means you will need to connect your device to the computer each time you reboot.

Step One

Create a folder on your desktop called Pwnage

Download the latest version of RedSn0w from here and place it in the Pwnage folder. Likewise, download the 6.0 firmware from here and place it in the Pwnage folder. (Note: you do not need to download the 6.0 firmware if you are already on iOS 6.0)

Extract the RedSn0w zip file by double clicking it.

Step Two: 

If you haven't already updated to iOS 6 then open iTunes from your dock.

Select your iPhone from the list of devices on the left. Now hold down Option and click the Restore button. Restore is preferred as it won't create any wasted space on your iPhone.

Navigate to the Pwnage folder on your desktop and select the 6.0 firmware ipsw. Click the Choose button to continue.

iTunes will now update your iPhone to the new firmware.

Step Three

Right click or control-click the redsn0w application from the redsn0w folder we extracted earlier and chooseOpen from the popup menu that appears.

Step Four

Once RedSn0w opens ensure your device is connected and click the Jailbreak button

Step Five

Connect your device, turn it off, then click the Next button

Step Six

RedSn0w will now guide you through the steps to get into DFU mode.

Hold down both the Home button and the Power button for 10 seconds.

Release the Power button and continue holding the Home button until RedSn0w detects the device.

Step Seven

Your iPhone will now be exploited with limera1n.

Step Eight

RedSn0w will now prepare the jailbreak data.

Step Nine

Select Cydia from the list of options and click Next.

Step Ten

Your iPhone will now be rebooted again and RedSn0w will begin uploading the new RAM Disk and Kernel.

Step Eleven

Once this is complete you will be notified that RedSn0w is done.

BOOT TETHERED

Once you have jailbroken you will need to rerun redsn0w to boot tethered only if you have a new bootrom iPhone 3GS.

Step One

From the main RedSn0w menu click the Extras button.

Step Two

Select Just boot from the Extras menu to boot tethered and follow the instructions to put your device into DFU mode again for boot.

*A big thanks is owed to the iPhone Dev-Team and Geohot for their hard work and contribution to the iPhone community.