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Yeah that link I posted didn't end up taking you to the right place. Just click the tech support tab on SCTFlash.com and download the livewireupdater. You'll need the USB drivers loaded first so download them as well.
SCT changed the X3 into an SF3 on 7-25-2008 so be careful when you're choosing your software and read all of the prompts. I think they've made it confusing because older X3's are now a different part number than what is printed on the bottom of the unit.
You shouldn't need to update the firmware just to get the tunes installed, you'll use the live-loader button to load the tunes (not the file transfer which would make sense)..
Anyway it's pretty self explanatory once you get going. You can go ahead and try one of the preloaded SCT tunes while you're waiting on Eric. They are fun but smokey.
2005 F250 XLT crew cab used for camper towing, kid hauling and commuting:
Banks Monster Exhaust, Banks Ram Air Intake, SCT with tunes from Innovative Diesel, Zoodad mod, High Idle Mod, Reverse light floods, ARE Shell, HAM Radio Antennas (80m-10m screwdriver, 2m, 440, 6m whip)
First 25k was run on Biodiesel but it's too much trouble so I'm dino-diesel only now > 50k