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After downloading the update, deployed from server, the device rebooted and got stuck in Windows Boot Manager. It says:

Windows failed to start. A recent hardware or software change might be the cause. Please insert installation disk... LOL

File:\EFT\Microsoft\Boot\BCD Station: 0x000034 Info: The Boot configuration Data for your PC is missing or contains errors

Already tried the common hard reset sequences; no results. Device remains restarting on the Lumia screen followed by Windows Boot Manager message

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Have you tried to use Windows Device Recovery Tools?

I have the same problem before. I tried to use Windows Phone Recovery Tools to rollback to WP8.1 Denim and re-upgrade it to Windows 10 Mobile. It works like charm :D

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