I wanted to change the icons on Big Sur and ran into the same problems. I tried to follow the steps here (https://apple.stackexchange.com/a/395509/387852) but on step 6:

sudo mount -o nobrowse -t apfs DISK_PATH MOUNT_PATH

I ran into this issue

mount_apfs: volume could not be mounted: Resource busy
mount: /Users/timrupp/newicons failed with 75

I really am no programmer or have any real clue how to use Terminal. I'd appreciate any help.

  • 4
    What do you mean by „the same problems“?
    – nohillside
    Aug 30, 2020 at 9:27
  • Resource busy suggests something is running in the directory /Users/timrupp/newicons, for example did run your sudo command from there? If so, then do cd ~ ; sudo mount etc. Aug 30, 2020 at 10:33
  • I have yet to try macOS Big Sur because I don't waste time on beta products anymore, however, I'd attempt to replace icons from Terminal while still in macOS Recovery. Aug 30, 2020 at 14:44
  • @user3439894 you need to bless the snapshot afterwards for Big Sur to boot. Maybe I'll write a tutorial for it sometime.
    – Oion Akif
    Aug 30, 2020 at 19:18
  • @Skeleton Bow, Does selecting the Startup Disk from macOS Recovery bless it? A tutorial would be nice. However, I'm not moving to macOS Big Sur until at least 11.0.3 (if then, I wait and see hot things go). Aug 30, 2020 at 19:34

1 Answer 1


diskutil unmountDisk force DISK_PATH (or whatever your disk is)


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