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Thanks very much, Jake Lo. It's done and working now. I will describe te entire process I followed under Big Sur 11.1 just in case someone has the same problem: 1. Reboot system with Recovery partition. If you don't see Recovery in Opencore Picker, press spacebar and you will see it. 2. In Recovery screen, click Tools>Terminal and write: csrutil disable 3. Press RETURN on your keyboard and reboot system in normal mode (main OS X partition). 4. Download alc_fix.zip. Open Download folder and unzip file. 5. Open Terminal and open a BASH session typing bash 6. Press RETURN 7. type in Terminal with Return after every order cd Downloads cd alc_fix sudo ./install.sh 8. After the last Return you will see a message in Terminal, ending with "Done!" 9. Type in Terminal exit 10. Press Return and close Terminal 11. Reboot again in Recovery mode pressing spacebar if necesary. 12. In Recovery Screen, click Tools>Terminal and write: csrutil enable 13. Press RETURN and reboot system in normal mode again. 14. After writing your password you will see a message saying: "AlcplugFix is an app downloaded from INTERNET. Are you sure you wnat to open it?" 15. Choose OPEN button and that's all. I hope it will be useful. Thanks to Jake Lo. As usual, he solved the trouble. Entropic.