Before we begin, we need to tell you this is a tethered jailbreak for non-A5 devices only. Thus, it would not work with the iPhone 4S, and iPad 2. If you have an eligible device like the iPhone 4, or iPad 1, then you can follow this procedure.
Following video gives you the demonstration of the procedure:
Now to do it yourself, follow this procedure:
STEP 1 - Place your device into Device Firmware Update (DFU) mode.
STEP 2 - Download Sn0wBreeze 2.9.2. Execute in Windows XP compatibility mode as an administrator.
STEP 3 - Click OK, Next, and then click Browse. Select the iOS 5.1 firmware for your device. You should ensure that Sn0wbreeze is able to verify the device. Click Next.
STEP 4 - Click Simple Mode from your list of options. When you do that, Sn0wBreeze will build a custom firmware file and place it on your desktop when completed.
STEP 5 - Once the firmware is built, click OK. Place your device back into DFU mode and click Start. This will place your device into PwnedDFU mode.
STEP 6 - Close Sn0wBreeze, open iTunes, and then hold the Shift key on your keyboard. Click Restore. Select the custom Sn0wBreeze firmware from your desktop, and let iTunes restore your device.
STEP 7 - Once restored, setup your device. Now you should see the Cydia icon on page 2 of your Home screen. Place your device back into DFU mode.
STEP 8 - Locate the iBooty folder on your desktop that Sn0wBreeze has created, and execute iBooty. Select your device from the drop down menu in the bottom right-hand corner, and click start. This will perform a tethered boot so that you can use your device. Every time you reboot your device, you will need to put your device into DFU mode and perform a tethered boot by using iBooty.
STEP 9 - You can setup Cydia once your device is back at your Home screen. Now your newly jailbroken device is ready to use.
Did you find this procedure, simple and helpful? Did you achieve desired results? Post your comments.
Source: iDownload Blog