Hi gilsonfromsao paulo,
We appreciate you reaching out to us. We understand that you are no longer getting the Ethernet interface after an update.
We’d like to gather additional details that may help us be in a better position to assist you.
Have you had the chance to try a different ethernet cable?
Have you had the chance to try a different ethernet port?
Have you had the chance to try a direct modem connection?
Have you had the chance to try a different network?
If you answer yes to all questions and the issue persists, we recommend that you check if the issue persists while on safe mode.
Below is an article to help guide you through the process.
How to use safe mode on your Mac
Also, we recommend that you check if the issue persists when signed in on a different user account.
The article below can help if you do not have any other user account to test with.
Set up users, guests, and groups on Mac
Take care!