@OrlandoSoares Olá... Recomendo aos que tiverem problemas semelhantes, a darem uma olhada nesse thread em ingles... https://community.tp-link.com/en/home/forum/topic/194950?page=1 Fiz os passos...

Hi there... Had the same 100Mbps limitation. Followed your steps solution, reebooted the C6, but the LAN1 was still on 100Mbps. Then i changed the cable to the LAN2 port, and it was solved,...