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downgrading my baseband software?


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Hi Just got an iPhone for my birthday, wanna unlock it.

stupidly, when i first plugged it in, i let it upgrade its firmware from apple software update, it updated to 2.1.1 i think.

however i now cant use the yellowsn0w as the update also updated my baseband firmware to 02.30.03.


is anyone aware of a way to "downgrade" said firmware of the baseband so that i can get yellowsn0w to work.

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