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Redsn0w by DevTeam lets you jailbreak your iPhone 4 device for total control (see why you should jailbreak here). Currently, the 0.9.6b5 version of Redsn0w allows you to perform a jailbreak connected to your device that has already been upgraded to 4.2.1 firmware, which means that you must use redsn0w every time the device boots, otherwise all your jailbreak data will be erased. however, it will not unlock the device, which allows it to be used with different GSM operators in the world.
ingredients:
- An iPhone 4 updated to firmware 4.2.1
- Firmware version 4.2.1 for iPhone 4
- iTunes 10.1 or later
- Redsn0w 0.9.6b5 for Mac.
Back up all your information using iTunes before following this tutorial.
1. Download redsn0w and extract the ZIP. Double-click to open the redsn0w application.
2. Click the "Browse" button under the text. It will ask you to locate a firmware file, choose the firmware 4.2.1 for iPhone 4 and click "Open".
3. It will then process the firmware file. After indicating "IPSW successfully identified", click on the "Next" button located at the bottom right to download some jailbreak data from the server.
4. Then choose if you want to install cydia and click on the 'Next' button again.
5. Now you will be asked to connect the device to your Mac / PC, then turn it off, do it, and click "Next". Now follow the instructions on the screen to continue.
6. The device restarts several times and displays the 'Downloading Jailbreak Data' logo on its screen, while redsn0w sends the modified files to the device. When redsn0w is finished, click the "Finish" button and let the rest of the process continue on the device. Please wait.
7. After rebooting, it may go into recovery mode. At this point, press and hold the Home and Power buttons until the screen turns off and simply press the power button to turn it on. 39; light. When booting, your device should now be jailbroken with Cydia on the home screen.
All the credit for this great tool goes to DevTeam.
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