Solution to the failure of the security update that left the Ethernet connection of your Mac disabled

Although more and more users use wireless connections to access the network, it is no less true that in certain professional areas due to security measures or simply because we are in an area with poor coverage it is always to appreciate the alternative cable connection.

However and as we mentioned in the previous article, the latest security update "031-51913 Incompatible Kernel Extension Configuration Data 3.28.1" has left the ethernet connection disabled, making it impossible to use since it has left the driver Broadcom BCM5701 disabled on a blacklist and which comes standard on many Mac models. However, there is a solution, let's see how to get it started.

The first thing you should do is check what version you have installed, for this we will access > About this Mac> System report. There we will look (as seen in the image above), the "Installations" section where the version will be shown. In my case I already have the updated version 3.28.2, however, if you see that you are still with version 3.28.1 you must follow these steps.

1. If you have a Wi-Fi connection, you just have to connect to it so that the latest update is automatically installed
2. If you do not have a Wi-Fi connection, you will have to go back to a previous copy to download the latest update instead.

Wi-Fi connection available

If we have an alternative connection available via Wi-Fi, we will only have to launch the system terminal through Applications> Utilities> Terminal and enter the following command:

sudo software update –background

Once we have done this, we will double check using the previous method that the update has been installed correctly. When we have verified it, we will only have to restart our Mac.

Wi-Fi connection not available

If we are in the position of not having a Wi-Fi connection available, we will only have to restart our Mac and start it in recovery mode.

When we have the main screen we will access the upper menu in Utilities and select the terminal as long as we have verified in disk utilities that Macintosh HD or our main boot disk is mounted.

We will introduce this command:

rm-rf "/ Volumes / Macintosh HD / System / Library / Extensions / AppleKextExcludeList.kext"

In this case, we will restart the Mac again and load a backup copy of this folder, with which the Ethernet connection should work again. To apply the updated security patch, we just have to go back to the terminal, this time within OS X, and enter:

sudo software update –background

I hope that at least you served as a little guide to solve this silly mistake that sometimes more than helping, complicates our lives.