Downgrade 06.15.00 to 05.13.04 Baseband iPhone 3GS

iPhone Dev team has released Redsnow 0.9.14b1 to downgrade the baseband 06.15.00 to 05.13.04 on iPhone 3GS so that you can install iOS 6 firmware and use the 3D Maps feature and voice guide navigation . It will also Unlock iPhone 3GS and give Full GPS Support on iOS 6 . If you updated to the iPad baseband to get an unlock for your iPhone 3GS , this is the chance to get back the GPS capabilities of your phone .

IPSW-downgrade baseband iphone

Steps to Downgrade iPhone 3GS 06.15.00 to 05.13.04 Baseband :

  1. First backup all your data on the iPhone 3GS using iTunes
  2. Now Download Redsn0w 0.9.14b1 on your Mac or PC
  3. Download the .ipsw file for the exact firmware you are running on your device . You can find which version of iOS you are running by going to Settings > General > About > Version
  4. Launch Redsnow in Administrator mode in PC
  5. Go to Extras > Select IPSW button and browse to the ipsw file downloaded in Step 3
  6. Redsn0w will verify the ipsw file and ask you whether if you have an older bootrom iPhone 3GS or a new one, read the on-screen instructions very, very carefully before you proceed
  7. Go back to Redsnow home page and click on Jailbreak button
  8. Redsnow will now process the ipsw file displaying Preparing the Jailbreak Data screen . After the process is complete you will get a set of different options. Simply check the Downgrade from iPad Baseband and Install Cydia options and click on Next button . Those who are already running a jailbroken iPhone 3GS need not  check the Install Cydia option
  9. Follow onscreen instructions to put your iPhone 3GS in DFU mode iphone 3GS DFU mode how to
  10. Redsnow will run some random codes on the screen after which your iPhone 3GS will reboot and will be on the unlockable 05.13.04 baseband iphone 3GS redsnow codes Redsn0w

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