Are the mentioned Hadiths that speak of "no good in the Berbers," and that "faith does not go beyond their throats," and that "sixty-nine parts of wickedness are in the Berbers" authentic? And do these Hadiths contradict the universality of Islam's message?

We congratulate you on adhering to the religion of Islam, which is the religion of all prophets. The measure of honor with Allah Almighty is piety, not lineage or color. Islam has abolished the idea of superiority based on lineage, for Allah Almighty said: "O mankind, indeed We have created you from male and female and made you peoples and tribes that you may know one another. Indeed, the most noble of you in the sight of Allah is the most righteous of you. Indeed, Allah is Knowing and Acquainted" (Al-Hujurat:13). Historical experience has proven that Muslims have recognized the virtue of the pious regardless of their race or lineage. As for the hadiths you mentioned in the question, none of them are authentic, and some are weak and have objectionable texts. The Berbers entered Islam after the death of the Prophet, peace and blessings be upon him, and they were among the Muslim armies that conquered Al-Andalus.