I'm not sure what you mean by "dota2u9". Could you please provide more context or clarify your question? Are you asking about:

1. A specific update (u9) for the game Dota 2?

2. A mod or custom game mode called "u9" for Dota 2?

3. A typo or abbreviation for something related to Dota 2?

If you can give me more information, I'll be happy to help answer your question or provide more details about whatever you're asking regarding Dota 2.