Unlock iPhone OS 4 Beta on iPhone 3G with ultrasn0w

after the jailbreak of iPhone OS 4.0 BETA has been released and the subsequent update of Fuzzyband (baseband downgrader), it seems that the release for the 3.1.3 and higher jailbreak and unlock is just around the corner.

But first we have to be contend with the jailbreak and now the unlock of iPhone OS 4 Beta on iPhone 3G.

according to the post below, technically iPhone OS 4 Beta on iPhone 3G is unlockable.

here are the details.

Now that we have a jailbreak (developers only) for iPhone OS 4 Beta, and an upgraded version of Fuzzyband (Baseband downgrader). Technically, iPhone 3G can now be unlocked on the latest iPhone OS 4 Beta, provided that you have one of those rare iPhone 3G’s with 05.08 bootloader that is downgradable to 05.13.03 baseband of OS 4 to 04.26.08 so that ultrasn0w can unlock it.



NOTE: I haven’t tested this on my iPhone 3G. This is only for iPhone 3G with 05.08 bootloader. Proceed only at your own risk.

Step 1: First follow the complete step by step guide posted here to jailbreak iPhone 3G on iPhone OS 4 Beta firmware.

Step 2: Using Fuzzyband, downgrade your baseband 05.13.03 to 04.26.08. Step by step instructions for downgrading baseband can be found here.

Step 3: Now start “Cydia” on your iPhone and touch on “Manage” tab on the bottom. Now touch on “Sources” as seen in the screenshot below:


Note: T-Mobile users should disable 3G before installing ultrasn0w.



Step 4: Touch on “Edit” and then on “Add”. You will be prompted to enter a url source as seen in the screenshot below. Type “http://repo666.ultrasn0w.com” and touch on “Add Source”




Cydia will now automatically update your sources by following a series of automated steps.

Step 5: Once the repository has been added successfully, Search for “ultrasn0w” in Cydia and install this application.



Step 6: Now simply restart your iPhone.

If all goes well, you should now have an unlocked iPhone 3G running on iPhone OS 4 Beta.

original source


as in previous posts.,,do this at your own risk..