Feedback on the Dell Inspiron 5567 - Gamora KBL

Hello, I purchased a Dell 5567 notebook and unfortunately AMD Radeon R7 M445 is not being detected because Ubuntu and AMD drivers cause login failure, I even tried all the solutions given in the forums, but I could not solve it. Dell does not want to provide support, and provides no download link for the drivers. I need help solving the problem. I notice that here in Brazil, many users are going through the same problem, could they help me?