Mirror iPhone 4 with ATV2 - QUESTION!

I'm going over my friends house to jailbreak his AppleTV 2 and he has an iPhone 4. I wanted to know if there is a tweak I can install on his iPhone that will allow him to mirror his screen like I can do with my 4S onto his TV.

If not a tweak, like a way I can edit files to do it?

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

I need it to work with appletv, no cords