It sounds like you have not had to do this:
http://www.iclarified.com/entry/index.php?enid=4400
This is the process to back up certain temp files from itunes.
Does anyone using purplera1n have to do this?
Why is this such a big deal for dev team? They provided the link to the tutorial for it. If purplera1n doesn't need it, why are people backing these up?
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These files are important if you upgrade to 3.1 (which has a new baseband).
For now, you don't need to do anything other than follow this
http://www.modmyi.com/forums/iphone...n-mac-released-jailbreak-your-iphone-3gs.html
The whole process took under 10 mins.