Not possible. Modern Warfare 2 (2009) save data—rank, unlocks, stats, challenges—is **cryptographically bound to the Xbox Live profile (XUID)** that earned it. There is no official or unofficial transfer mechanism.
| Goal | Method |
|---|---|
| Play on a different profile | Sign in with that profile → Start new game. Progress is separate. |
| Share the game with family | Set console as **Home Xbox** for the purchasing account → other profiles can play the game (but earn their own stats). |
| Reset your own stats | In-game: Barracks → Reset Stats (Prestige) — irreversible. |
| Recover lost profile | If you lost access to the *original* Xbox Live account, recover it via account.microsoft.com → sign in on console → download profile. |
These use **Activision Accounts** (cross-progression). Link Xbox, PlayStation, Battle.net, Steam → progress follows the Activision ID, not the console profile. **This does not apply to MW2 2009.**
Bottom Line: On Xbox 360, MW2 2009 progress lives and dies with the gamertag that earned it. Start fresh or recover the original account.