All About Smartphones

For one reason or the other one need to downgrade baseband. As of this writing, iPhone 4/4S/5 can't have their baseband downgraded once upgraded through a stock IPSW restore. However, iPhone 3GS can have its baseband downgraded. Follow these steps to achieve a baseband downgrade for the iPhone 3GS. Step 1 Download the latest version of Redsn0w on your computer and extract to your desktop. Step 2 If your device is on iOS 6.1 or 6.0.1, you will still need to download 6.0 IPSW because that is what Redsn0w can support for now. Connect your device to the computer and let Redsn0w detect it. It will also notify you of the device's bootrom and firmware version just at the bottom of the window Step 3 Click on Extras, click on Select IPSW menu and the select iOS 6.0 IPSW that you downloaded. If you have a newer bootrom 3GS click yes Step 4 Go back and then select Jailbreak. Kernel will be patched and then a window will appear where you will check "D...

Updated: I decided to upgrade an iPhone 4 with baseband 04.10.01 running iOS 5.1.1. The device was hacktivated and unlocked using Gevey. After 30 minutes I successfully landed on iOS 6.1 baseband 04.10.01 and still unlocked with Gevey sim. Ultrasn0w 1.2.8 couldn't download because it was not compatible with my iOS 6.1 which is strange. Through out the whole process, both Gevey and SIM remained in the phone. Here are my steps in a easy fashion and i Hope you find it useful. This post was published in February before iOS 6.1.3 was launched. If you want to install iOS 6.1 now, you will need SHSH blobs NEEDED ITEMS 1. Sn0wbreeze 2.9.9 2. iOS 6.1  - 6.1.2 IPSW 3. Internet connection 4. Redsn0w 0.9.15b3 5. Ultrasn0w 1.2.7 and Mobile Substrate 6. iTools or iFunbox or iExplorer NOTE 1: This post does not apply to those that want to upgrade to iOS 6.1.3 NOTE 2: If you want to update to the IPSW in this post as of now (1/March /2013), you will need SHSH...