Update (04/11/2009): Those who have 05.11.xx baseband but have not been able to use fuzzyband’s baseband downgrader due to various reasons including non-supporting bootloader version should have a look at a new unlock tool released for the iPhone 3G and iPhone 3GS by Geohot. It’s known as blacksn0w, it will work for iPhones running the latest firmware 3.1.2 on baseband 05.11.07: http://www.gadgetlite.com/2009/11/04/blacksn0w-iphone-3g-3gs-os-3-1-2/
We’ve been increasing contacted about whether it is possible to downgrade the new iPhone OS 3.1′s newly upgraded baseband 05.11.07 on the iPhone 3G / 3GS. At first we were quite convinced that the iPhone Dev Team would soon work something out for those who have mistakenly upgraded their iPhone 3G / 3GS and wait. But now it seems many are now understandably eager and want to be able to use their locked up iPhones again. That’s the bad news, the good news now is that there is a method to safely downgrade your iPhone 3G’s updated baseband from 05.11.07 back to an ultrasn0w unlockable baseband – 04.26.08.
We must stress though, there is currently no method to downgrade 05.11.07 on the iPhone 3GS, this method will work for iPhone 3G only. Its also important to know that this downgrade does not concern users of the first generation iPhone as it is practically invulnerable to baseband changes. Downgrading only works on phones that have the 05.08 (5.8) bootloader from the factory.
Fuzzyband Downgrader is a relatively safe iPhone 3G baseband downgrader which we have featured before, the great thing about using it downgrade your iPhone 3G is that it works brilliantly in automatically detecting your iPhone’s baseband and bootloader version. A simple tap will start it off, which means even beginners who have no technical knowledge can use it too.
Fuzzyband Downgrader is available through ICY and Cydia, this means that you will need to jailbreak your iPhone. If you have already done so, refresh your sources and search for Fuzzyband and install the application.
Basically, the concept is, if you want to be able to unlock your iPhone 3G on OS version 3.1 then you can run Fuzzyband Downgrader so that the current version of ultrasn0w can unlock your iPhone 3G on firmware 3.1 (via the new Pwnage Tool) as your iPhone will then have its older baseband version 04.26.08 back.
For those who are already confused (and I don’t blame you), here are some steps which will make this process easier for you.
First make sure you have already jailbroken your iPhone 3G. Then look up Fuzzyband Downgrader via ICY or Cydia whichever you prefer…
Once you’ve got the application, start the Fuzzyband app and tap on the “Downgrade” button to automatically start detecting your baseband and begin downgrading from 05.11.07 to 04.26.08. When it is successful, it will say ” You’re ready for ultrasn0w!”.
If anyone has problems or suggestions for other better methods, we’d love to hear from you, just pop us a comment below or twitter us!