[Forza Motorsport 3] Help, please?

So here's what happened.
- Downloaded 360Revolution.
- Moved my save file (can't copy, unfortunately) from XBox 360 to USB.
- Used USB XTAF GUI to extract the ForzaProfile from the USB.
- Opened 360Revolution, modded just the credits and nothing else.
- Attempted to save. Error appeared (cannot find KV.bin or something?).
---- Assumed it saved anyway.
- Injected the ForzaProfile back into the USB drive.
- Copied the game file from USB back into XBox 360.
- Started the game.

... and here's where it all got messy.

- When game launched, it attempted to save, giving me a "Device Is Full" prompt, overwriting (apparently) my modded file, and restarted the game from scratch.

SO HERE'S WHAT I DID NEXT.

- Deleted the start-from-scratch save file.
- Got the USB drive, plugged it back into my computer, then injecting back the original ForzaProfile file (yes, gotta keep a backup, just in case) (and yes, I made perfectly sure I injected it into the right directory path and all).
- Plugged it back into the XBox 360.
- Copied the original file back into the console from the USB drive, and prayed to God it would work.
- NOPE. Still started from scratch.



Oh, dear me. I know I did something wrong. Could anyone help me out with this? I'm sorta kinda new to this modding thing, and I would really appreciate some help, lest my boyfriend wring me for this.

1. What is this KV.BIN that 360Revolution keeps asking me for?
2. Where can I download this KV.BIN?
3. Is there anything wrong with the method I used?
4. Is there any way I could save my original, unmodded save file?

Thank you in advance, to whomever would respond to this.


EDIT:
A few details, maybe it'd help...
- We don't play online.
- My dashboard is updated, I think? I have a kinect, so yeah.
- I don't really know if this is a resigning and/or rehashing issue, or if it has anything to do with the console and/or profile ID/s.

... also, how do I find out what my console and/or profile ID/s are?