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How Can I Fix A Windows10 Corrupt BCD Issue?
When the BCD file is not present or corrupted, and you have removed or formatted the partition on a separate drive with it's System Reserved label (and 500 MB in size) or a separate OEM recovering partition the user is likely to encounter the following message while trying to start Windows 10.

office.com/setup - If you're not able to boot into Windows 7/8/10 OS because of a damaged Boot Configuration Data (BCD) document, or your boot menu isn't showing all operating systems, you must to fix the BCD configuration file. If the Boot Configuration Data file has already been damaged the following article will assist you repair it applying the correct commands.