I guess this is appropriate here since Big Sur is still in development
Yesterday I created a new APFS partition with macOS Big Sur. I usually edit some files in /System/Library files to tweak my home setup to my liking, including some display settings. However the steps I usually take to be able to edit these files no longer work.
These steps were: Boot the Mac in recovery mode and go to the terminal,
Here I disable SIP using csrutil disable,
Reboot back in to Recovery Mode, open the terminal again
Remount the disk with write permissions using mount -uw /
Make the edits
However step 4 no longer seems to work on Big Sur as I am getting an error:
mount_apfs: volume could not be mounted: Permission denied
mount: / failed with 66
Is there another way to mount the file system with write permissions?