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Ethernet quit working after El Capitan upgrade


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Hello everyone!
I have an iMac 21,5 (mid2011).

After updating El Capitan my Ethernet quit working. When I update to Yosemite I already had this issue, but it can fixed this solution:

Go to HD -> Library -> Preferences
Rename "SystemConfiguration" to "SystemConfiguration.OLD"
Restart System


Today this solution dont work. System says I can't make this. How I can fix my issue?


Maybe I need to download and install new driver for Ethernet Card? But I don't know there I can download new driver and how I can install it. Do you can help me?

System info about my Ethernet Cards:



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Thanks, Slice. But I don't know how I can change a one file to another because system don't allow to do me it.

But I found another solution for my problem:

— Delete all network interfaces in System Preferences > Network
— Delete file /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist (and maybe you can need delete file /Library/Preferences/SystemConfiguration/preferences.plist)
— Reboot
— After Reboot go to System Preferences > Network and add all network interfaces (wi-fi Ethernet and other)
— Done!
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