How to upgrade a previously jailbroken iPhone to iOS 6 and preserve the baseband.

Steps to upgrade iPhone 3GS/3G to Firmware IOS6. Step 1: Upgrade your Itunes to latest. Step 2: Backup your iPhone to Itunes. Step 3: Download the latest Redsn0w version i.e.  Mac OSX   or  Windows Step 4: Run your Redsn0w latest version and click on option [ Extras ]. Step 5: Your iPhone should be at firmware version 5.1.1. Step 6: Select [ Even More ] and then [ Restore ] Step 7: After that select [ IPSW ] i.e. firmware version 6.0.1 (which needs to be downloaded in advance). Step 8: Select [ Yes ] to Preserve Baseband update. Step 9: Now get the device connected to DFU mode. Step 10: With the iPhone connected and switched off, when you click on next you go through DFU mode. Step 11: Redsn0w will prepare a  restore image and restore it to the iPhone while...

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Downgrade iPhone 3GS / 3G 06.15.00 To 05.13.04 Baseband

Please Follow the steps mentioned below:- Step 1: Download the latest version of Redsn0w, which is 0.9.14b1 (Windows/Mac), make sure that you have the correct version of said tool for your operating system. Step 2: Unzip the contents of the downloaded compressed file and save to a familiar location on your PC or Mac. Step 3: Download the IPSW file of iOS which is currently running on your device, use the search bar on the right-hand side of this post to hunt for the required files. Once downloaded and saved to a safe location, move to the next step. You can check which version of iOS you are running by going to Settings > General > About > Version. Step 4: Launch Redsn0w and click on the Extras button on screen. Step 5: Now click on the Select IPSW option....

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