This repository contains the configurations for Dell Precision 7520, running with Big Sur 11.0.1
The configuration allows internal speaker playback but no headphone playback. To enbale headphone playback, follow the guide in this link
To mount /usr/bin, boot to Recovery Mode and launch the Termainal.
mount -uw /
cd /Volumes/<Volume name>
cd ./Users/<user name>/<path to Jack fix>
cp -R /Users/yourusername/Desktop/Jack fix /usr/binIf the above approach does not work, try to follow this guide