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Download AT&T carrier file after 3.1 JB?

Hello. I've been running 3.01 JB on my 3GS with no problems. When the new AT&T MMS Carrier file came out, I carefully followed the instructions for downloading and installing the file without upgrading to 3.1. So at that point I had a 3.01 JB using the new AT&T carrier file and MMS was working perfectly.

Now, I've used the new Pwnage tool to get the 3.1 JB and all is well. My question is this. Now, when I plug in my iphone, iTunes asks if I want to download the new AT&T carrier file? I've been hitting cancel, but i'm wondering if I should download the file (which I assume is the same file I downloaded when I had the 3.01 JB) again?

thanks.
 
Once restored, do we lose all cydia apps and setup, like Winterboard, lockscreen info, i realsms etc.. do we have to redo everything from the beginning?

Can someone please give me a quick clarification?

I have a 3GS on AT&T that was jailbroken on 3.0 using purplera1n. I then upgraded straight to 3.1 from the jailbroken 3.0 (skipping 3.0.1). Can I go ahead and use the pwnage tool to jailbreak on 3.1, or do I need to downgrade to 3.0 first, using Saurik's method (my ECID is on file)?

Yes to both of you.

You must downgrade, jailbreak on 3.0 then you can jailbreak to 3.1
 
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