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I have an iPhone 3g and I'm trying to downgrade it from 4.2.1 to 3.1.3.

I downgraded it successfully and use redsn0w to boot it. It is factory unlocked by itunes, but it seems like it's not getting any signal though. Is it because that I have a baseband of 06.15.00? But how do I downgrade it if that's the issue?

Thanks guys!

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Reset to default
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I used Cydia to fix the no signal issue with my phone but i dont know if its possible without jailbreaking the phone.

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  • Can you describe in more detail how you used Cydia here?
    – nohillside ♦
    Commented Jul 18, 2013 at 5:10

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