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Upgrade iPhone 3G & 3GS to iOS 4.2.1 without Upgrading Baseband

iphone JailbreakIf you have an iPhone 3G or 3GS and need an unlock  for your phone then most probably you know about the 06.15.00 unlock method with ultrasn0w 1.2, but if you use that method there is no method of going back i.e. you will stuck with this baseband will lose warranty as it will expose your iPhone to apple, but you don’t worry as we have found a solution to that to.

If you have Modem Firmware 5.13.04 or below then follow the Steps Below but if You have already Upgraded then Click here to Downgrade your Baseband for iPhone 3G

Tools needed

1 . Custom firmware for iphone 3Gs / 3G  4.2.1

Download custom firmware iPhone 3Gs

Download custom firmware iPhone 3G

2. Download Redsn0w 0.9.6b

3. Download Apple original firmware

Download original firmware iPhone 3Gs

Download original firmware iPhone 3G

Save Everything in “Pwange” folder on your desktop

Guide :

1. Connect your phone with PC and switch off

2. Open redsn0w and choose Original firmware.

3. If you have newboot just press “yes”

4. now click “Next”

5. Choose “Just Enter pwned DFU mode right now” Click here to Know How

6- now click “Next” again “Next” and follow the screen.

After that open itunes and press “Shift + Restore” and choose custom firmware 4.2.1

it will finish very quickly

Once you update you firmware

1. Connect your phone with PC and switch off

2. Open redsnow and choose Original firmware

3. If you have newboot just press “yes”

4. now click “Next”

5. Choose Only “Install Cydia”

6. now click “Next” again “Next” and follow the screen.

If you r getting White Cydia Icon just switch of your phone and open redsnow choose Stock firmware 4.2.1 and choose the option “Just boot tethered right now” and click “next” again “next” then follow the screen then you will see the cydia.

Finally you can see your phones is with your old Baseband. now just you can install the ultrasn0w 1.2 from Cydia

Click Here to unlock