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[How to] Upgrade iPhone 3GS/iPhone 4 to iOS 5 Without Upgrading and Preserving your Baseband

A lot of current iPhone 3GS or iPhone 4 users are using a Carrier locked device, having unlocked it using Ultrasn0w want to try out iOS5.

iOS 5 will upgrade your current Baseband thereby leading you to lose your Unlock.

Fear not, the latest build of Redsn0w will allow you to easily preserve your Baseband while still upgrading the Operating System to iOS 5.

The steps are fairly simple. Follow the guide below:

Things you’ll require:

Steps:

1. Open up Redsn0w and Click on Extras.

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Download Redsnow 0.9.9b6 to Jailbreak iOS 5 on Windows

The iPhone Dev Team has finally released an update to Redsn0w which adds support for Windows users. The previous version released a week back lacked support for Jailbreaking iOS5 final on Windows.

This update also fixes the aGPS issues with iPhone 3GS.

From the iPhone Dev-Team:

We’ve released version 0.9.9b6 of redsn0w, with both a functional fix and cosmetic fix for iOS5 jailbreakers. For iPhone3GS owners with the 06.15 baseband, this redsn0w eliminates the network crash you saw when using Location Services in iOS5 (in fact, you don’t even need to disable Location Services anymore during the initial setup). The cosmetic fix is to the visual countdown you see when going into DFU mode.

It’s okay to re-run this redsn0w over an existing device jailbroken at iOS5. Just choose “Jailbreak” again and de-select Cydia (in other words, all the checkboxes will be unchecked).  If you are lucky enough to have an old-bootrom iPhone3GS, please pre-select the IPSW first (redsn0w can’t yet auto-detect the FW version of your old-bootrom 3GS if it’s already been jailbroken).

Download:

Redsn0w 0.9.9b6 for Windows
Redsn0w 0.9.9b6 for Mac

Follow this Guide in case you’re not already familiar with using Redsn0w.