I have macOS Catalina 10.15.3 (FileVault2 is enabled) installed with Windows 10 in dual-boot and I was able to sucessfully change the Windows icon, but I can't figure out how to modify the icon for my Macintosh HD drive.

I tried with SIP disabled :

- to replace ".VolumeIcon.icns" inside /System/Volume/Data/ by a custom one
- To use the Get-Info box from the Finder and changing the icon from here

The changes are working inside the Finder but not when holding "Alt" and using the Mac Startup Manager..

Is there a proper way to achieve this?

  • Did you try updating the preboot volume? That's what the firmware looks at before it can unlock the rest. – lx07 Feb 19 at 20:43
  • I just gave it a try and used this command : sudo cp /Users/admin/Desktop/icon.icns /Volume/Preboot/*****/System/Library/CoreService/.VolumeIcon.icns but sadly it didn't worked. – AppleIx Feb 20 at 1:16
  • Does the Mac ask for the password to unlock the before or after displaying the icons in the Startup Manager? – David Anderson Feb 20 at 1:22
  • The only password asked before i can get into the Startup Manager is the Firmware password so not related i think. I can make a video of the boot process it that could help. – AppleIx Feb 20 at 13:58
  • Here is a video of the mac booting : youtu.be/y3dNZ_jmWm8 – AppleIx Feb 20 at 14:26

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