Will I Get Banned for Unwanted Prestige Boost in MW2? Highly Unlikely

It's highly unlikely you'll be banned from Xbox Live for reaching 9th Prestige via a friend's help in Modern Warfare 2.

Why?

• Prestige is cosmetic—no gameplay advantage
• Xbox Live bans target serious offenses: cheating, exploits, harassment
• Boosting is generally tolerated, though against the game's spirit

Cautions

• If an exploit/glitch was used, a ban is possible
• Sudden rank jumps might flag Activision's systems (rare)
• Avoid methods that feel like blatant cheating

Risk is minimal, but contact Xbox Support if concerned.