So, just open up the 2.1 version of Odin with only F-reset time selected and the phone tick box checked and the root66 file and hit start?
Firstly you need to be using Odin version 3.07 .
You're going to plug your phone in first and then you're going to start Odin. I think, if I remember correctly, the comport pulls up in red. Then you are going to leave all the little check boxes alone, the only 2 that should be selected are Auto reboot and F. Reset Time and they are already selected when you start Odin. Then you are going to click on the PDA button and select the file you downloaded to flash and find the file you downloaded and select it. Then just press start, it will seem like its frozen towards the end of flashing, but its not DO NOT unplug your phone unless you want a pretty paperweight. That should be all you have to do. ALSO there won't be a comport number on your phones screen, only on the Odin screen, and like I said above I am pretty sure that the comport number is always in red but you need to make sure the stock ROM you downloaded to flash in Odin was one of the ones in Droidstyle's guide only.
I know there are a ****load of stickies but they aren't confusing they're there to keep something like this from happening, its generally best to ask questions first if you don't know what you're doing or just read through all of the stickies that pertain to what you're trying to do. When I first was trying to figure out how to unlock and flash for the very first time I read every sticky and post in the development section that had anything to do with my phones specific processes. That's how I learned what to do, even the stuff I didnt need to know at the time I still read just because I might need it one day.
Sent from one of the many Anthropomorphic Personalities on the Disc