Fuzzyband

Update : Version  4.0~b4~2 released !
Download 4.0~b4~2 : Link

iPhone 3G, you have recently upgrade to Firmware 3.1.3 then your baseband has changed.
This utility will permit you to downgrade your baseband 05.12.01 to baseband 05.08 to be able to use Ultrasn0w).

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