#DOWNGRADE FIRMWARE 3GS INSTALL#
Search for “ultrasn0w” in Cydia and install this application. Cydia will now automatically update your sources by following a series of automated steps.Ĩ. You will be prompted to enter a url source as seen in the screenshot below. Press to select the Manage tab at the bottom of the screen and touch on SourcesĦ. Press to launch Cydia Installer from your Springboard.ĥ. Once you are done with the jailbreak, you can now unlock your iPhone running jailbroken firmware 3.1.2 by using ultrasn0w 0.9.Ĥ. Follow the guide here to jailbreak your iPhone 3G or 3GS using PwnageTool on firmware 3.1.2.ģ. Download and install the latest version of iTunes if you haven’t already.Ģ.
#DOWNGRADE FIRMWARE 3GS HOW TO#
How to Unlock iPhone 3G 3GS 3.1.2 firmware with Ultrasn0w?ġ. If you have upgraded directly to iPhone 3.1.2 stock firmware from iTunes then you are pretty much out of luck for now. Note: This unlocking guide will work for you only if your Modem Firmware (Baseband) version is 04.26.08. Once you have a Jailbreaked iPhone then you can use these easy steps to Unlock your iPhone. You won’t notice anything about it other than that your third-party sim now works. It injects the payload at boot and also whenever there is a baseband reset. UltraSn0w is a small daemon that is launched on boot.
Before you can follow these instructions you must have a jailbroken iPhone if you haven’t jailbreaked your iPhone 3G then follow our guide on How to Jailbreak iPhone 3G on OS 3.1.2 Pwnage Tool. This unlocking guide applies to iPhone 3G and 3GS only.
The following step-by-step tutorial will help you unlock your iPhone 3G and iPhone 3GS with the latest iPhone 3.1.2 firmware using ultrasn0w.
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