Good news for the peoples who upgraded their iPhone 3G to OS 3.1 and lost their baseband. iPhone OS 3.1 updates your current baseband to 05.11.07 which is not unlock able at the moment because Ultrasn0w is not supported by the latest baseband. Bigboss released Fyzzyband 3.1GM a while ago. Fuzzyband Downgrader is a safer iPhone 3G Baseband Downgrader as this one detects your baseband and bootloader version and does the wright thing first. In other words Fuzzyband Downgrader detects your bootloader and baseband and downgrade it with a simple click. Fuzzyband Downgrader available in ICY and Cydia just refresh your sources and search for Fuzzyband and install the application.
To install Fuzzyband your phone must be jailbreaked and you need a WiFi connection. If you haven’t jailbreaked yet then follow our Jailbreak guide How to Jailbreak iPhone 3G on OS 3.1 Pwnage Tool (Mac)
Please Note :
- Downgrading works from any version greater than 4.26.08. It will put your baseband back at version 4.26.08 which is the current unlockable version by ultrasn0w.
- Downgrading only works on phones that have the 05.08 (5.8) Bootloader from the factory. This is a very limited number of phones that were released in the first few weeks of the 3G production cycle.
- If you do not know your bootloader then you can run Fuzzyband and it will report the version number for you.