Downgrade iPhone 3G 3.1.3 Baseband 05.12.01 With Fuzzyband

Good news for those who upgraded their iphone3G to OS 3.1.3 and lost their baseband. As you know Apple introduced a new baseband 05.12.01 with iPhone OS 3.1.3 update, and latest baseband 05.12.01 is  un-hackable at the moment because Ultrasn0w/Blacksn0w doesn’t support. Bigboss released Fyzzyband 3.1.3-1 a while ago in Cydia. Fuzzyband Downgrader is a saferiPhone 3G Baseband Downgrader as this one detects your baseband and bootloader version and does the right thing first.

In other words Fuzzyband Downgrader detects your bootloader and baseband and downgrade it with a simple click if your bootloader is vulnerable to Fuzzyband . Fuzzyband Downgrader available in Cydia, just refresh your sources and search for Fuzzyband and install the application

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 hackable by ultrasn0w.
• Downgrading only works on iPhone 3G with 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.
• iPhone 3GS and large numbers of iPhone 3G aren’t supported by the Fuzzyband, so in case your baseband is updated then wait for Dev team/GeoHot to release any workaround. This may take weeks or months.

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Source: ihackintosh

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