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just a curiosity... why is it not possible to downgrade the baseband on any iphone? If apple updates it when a FW with a new baseband comes out, why can't we somehow put an old baseband into a custom firmware and have itunes downgrade it?

asked 12 Mar '11, 21:07

edoz's gravatar image

edoz
167611


It's because the baseband is actually stored on a separate chip (it even has it's own CPU!). Anyway we cannot actually downgrade without exploiting the chip. The reason that the DevTeam were able to upgrade the 3GS baseband to the iPad 06.15.00, was because it is an UPGRADE, not a downgrade. So the reason that it can't be downgraded is because the baseband chip HASN'T yet been cracked. And the reason that the DevTeam haven't yet found an exploit is that they are too busy exploiting other parts of the phone, e.g to give us untethered jailbreaks or carrier unlocks.

Hope this clears things up,

Dan

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answered 06 May '11, 16:14

danlocke's gravatar image

danlocke
161

Not sure, I think you can prevent it from updating, but downgrading... I don't think so. Else a lot of people would do it.

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answered 12 Mar '11, 21:18

matoetheiostream's gravatar image

matoetheiostream
73344752

yeah, everybody is saying it is not possible, but nobody is explaining why. I'd appreciate some concrete reference, if any :-) Thanks!

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answered 06 May '11, 11:18

shuusaku's gravatar image

shuusaku
1.5k543765

I'm with you,and don't get me wrong,I'm not complaining just curious also. There was a baseband down grade available on the 3G with fuzzyband,I wonder what the difference is and would I understand it if you explained it to me. -Just curious and extremely grateful to the hacking gods!

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answered 06 May '11, 14:44

jimilee2's gravatar image

jimilee2
1

I'm not sure why either, but i have heard that musclenerd was going to work on it, but i4 unlock was priority.

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answered 06 May '11, 15:23

mjandar's gravatar image

mjandar
1111

You can replace the base band chip with new one for 60$. It will roll back your bb from 6.15.0 to 5.?.?. I have seen a u tube video.

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answered 06 May '11, 16:47

Rlamba's gravatar image

Rlamba
612117

Serious point! when i updated lots of 3GS with 6.15.00 modem to iOS 5, BB was downgraded via itunes with no other tools!!! maybe it will help to someone :) Maybe someone can make some custom iOS 5.ipsw with unlockable modem version, and lots of ppl gets their gps back and lose extra battery drains :)

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answered 27 Nov '11, 08:12

vit4lik's gravatar image

vit4lik
112

edited 02 Feb '12, 23:11

spockers's gravatar image

spockers ♦♦
69.9k3911660

The reason that fuzzyband can downgrade baseband is because theres a exploit for the 5.8 baseband bootloader theres no exploit for anything higher

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answered 27 Nov '11, 17:02

1L1keTurtles's gravatar image

1L1keTurtles
2.4k22729

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Asked: 12 Mar '11, 21:07

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Last updated: 02 Feb '12, 23:11

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