Help with jailbreaking and Cydia for iPhones, iPads, and iPod touches.

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

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.

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

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!

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

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.

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 :)

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