So, there is no stock T-Mobile US .sbf availible??

---

I've looked around and it looks like that this is indeed the case but I wanted to be sure. I have a t-mobile defy on t-mobile US. I'm currently running the first leaked 3.42 T-Mobile US Froyo ROM. Didn't make a backup. Noob mistake. So am I SOL for upgrading to the Official T-Mobile US Froyo ROM?

No. One of the members made a how to, to downgrade. It involves backing down to the 2.34, and using a nandroid image.

I see a nandroid for the official rom has been posted and I just downloaded it. Do I need to downgrade first or can i just flash the nandroid over the T-Mobile 3.42 build I'm using now?

Here's the restore guide:

http://forum.xda-developers.com/showthread.php?t=985425

RSD this...

http://forum.xda-developers.com/showthread.php?t=922430