thunderbolt to ethernet adapter not working on my Macbook white (13-inch, Mid 2010)

Hey

I bought "thunderbolt to ethernet adapter". It's not working with my MB white. I searched for a solution but nothing worked

I have latest updates

what's driving me crazy is that it's working with my brother's MBP late 2011 with no problems at all

what's wrong with my laptops? 😮

waiting you guys