![]() (Optional) Choose "p" to have a look at your current GPT partitions, and potentially create a backup of them. However, in my case, more work had to be done as I explain at the end of the answer.ĭisable SIP, otherwise you get error the following error when running gdisk: Problem opening /dev/disk0 for reading! Error is 1.Ĭreate a new Protective MBR for your disk using gdisk, start by running on the terminal: sudo gdisk /dev/disk0 The steps below will make the error 0xc00000bb effectively disappear and, for seemed to be enough to fix the triple boot. ![]() So here's how the error looks like, when trying to boot Windows from rEFInd: I will formalize answer seeing as the user is gone and I have (sort of) confirmed that the instructions work:
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