I am trying to install Windows 10 on my MacBook Pro 15-inch 2019, (macOS Catalina 10.15.5) using Boot Camp. I have two different Win10 ISO files. They both gives me this error:

Windows could not update the computer's boot configuration. Installation cannot proceed.

I have seen some "fixes" online, but none of them has been working for me. I have tried the following:

  1. Re-run Boot Camp Assistant to remove the Windows partition and restore the full Mac HD as a single partition.
  2. Run a PRAM reset (restart, while screen is still black, hold down ⌘+Option+P+R and keep them pressed until you hear the startup sound a second time).
  3. Open disk utility and repair permissions on the Macintosh HD partition. TWICE.
  4. Start Boot Camp Assistant again.

Any tips?

  • I though the Boot Configuration is not stored in the Windows partition or any partitions containing the Macintosh HD volume. I thought the Boot Configuration was stored in the EFI partition, when installing Windows to UEFI boot. Jun 14 '20 at 16:12
  • @DavidAnderson What do you mean?
    – Koruy
    Jun 14 '20 at 17:26
  • What macOS version are you on? Add that to your question.
    – Nathan
    Jun 14 '20 at 18:31
  • @Nathan Sure, added now.
    – Koruy
    Jun 14 '20 at 19:01
  • @Koruy: You did not completely remove Windows from the drive. There are also files in the EFI volume that need to be removed. I put the procedure as an answer. Jun 15 '20 at 1:59

To completely remove any previous installations of Windows, you would have to remove the EFI/Boot and EFI/Windows folders from the EFI volume. The EFI\Windows\Boot folder contains the Boot Configuration Data (BCD) file. You can mount this volume by using the command given below.

sudo diskutil mount disk0s1

You can use the Finder application to move the folders to the trash. Afterwards, empty the trash. You can unmount the EFI volume by using the command given below.

diskutil unmount disk0s1


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .