Delete an EFI partition with diskpart
EFI partitions cannot just be deleted throught windows you need to use special software like diskpart.
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techjourney.net/diskpart-cannot-delete-a-protected-partition...
When attempting to delete a partition or volume with “DELETE PARTITION” command in DiskPart, primarily to remove hidden or system protected partitions, the deletion operation failed with the following error message:
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www.winability.com/delete-protected-efi-disk-partition/
This article shows how to use the DISKPART Windows tool to erase a hard disk that has a protected EFI partition.
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