Apple has been fighting the downgrade for sometime now starting with the 3GS and the required verification signature through the apple servers hence the 3194 error you get when trying to downgrade your OS version on a 3GS and now 3G with newer versions. There are of course ways around it (using custom builds) but it just makes it more of a hassle. ANd thankfully for stuff like TinyUmbrella you can save your baseband and restore to it. I don't know how this will work with IOS 5 but I'm sure there will be a fix for it.
Slashdot Mirror
Apple has been fighting the downgrade for sometime now starting with the 3GS and the required verification signature through the apple servers hence the 3194 error you get when trying to downgrade your OS version on a 3GS and now 3G with newer versions. There are of course ways around it (using custom builds) but it just makes it more of a hassle. ANd thankfully for stuff like TinyUmbrella you can save your baseband and restore to it. I don't know how this will work with IOS 5 but I'm sure there will be a fix for it.