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I updated my 2012 mac pro today to High Sierra. I could not boot into windows 7 on boot camp thereafter. I got the dreaded black screen with "Bootcamp: no bootable device – insert boot disk and press any key" error.

I tried the third party utility gdisk suggested by David Anderson in 2018 but it did not work for me.

The hard drive that I boot from has 4 partitions:

  1. EFI System Partition
  2. MacHD Partition
  3. Recovery HD
  4. BOOTCAMP

When I entered three GPT partition numbers (2 3 4) as per david anderson's suggestion to use gdisk I got the following errors:

"Type from one to three GPT partition numbers, separated by spaces, to be added to the hybrid MBR, in sequence: 2 3 4"

GPT partition #2 does not exist or is too big: skipping

GPT partition #3 does not exist or is too big: skipping

GPT partition #4 does not exist or is too big: skipping

At first, I wondered if I should have only specified the bootcamp partition (#4) but then I realized that even that partition had the same error.

Can anyone offer some advice at this point? I really want my bootcamp to work. Thanks

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