Repair failed Windows 10 update

Repair failed Windows 10 update
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Date: Monday 27th July 2010

Introduction
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On a recent Windows 10 update, a friend's computer failed to boot and displayed the following:

    error: no such partition.
    Entering rescue mode...
    grub rescue>

After some researching and testing I found the following method worked.

Preparation
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If you don't have one, make a bootable Windows 10 install USB.
You will need a blank 8gb USB.
See: https://support.microsoft.com/en-gb/help/15088/windows-10-create-installation-media

Repair procedure
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a) Boot from Windows 10 install USB.
   Example: on HP tap <escape> key as starting up to reach startup menu then <f9> to choose boot from USB.

b) At first "Windows Setup" window, check the language, time & currency, and keyboard are correct for you then click on "Next".

c) At second "Windows Setup" window, select "Repair your computer" (bottom left on screen).

d) Click on "Troubleshoot"

e) Click on "Command prompt"

f) Type command:  bootsect/nt60 sys

    example    X:\Sources>bootsect/nt60 sys
    You should see: "Bootcode was successfully updated on all targeted volumes."

g) Type command:  bootrec /fixmbr

    example    X:\Sources>bootrec /fixmbr
    You should see: "The operation completed successfully."

h) Type command:  bootrec /fixboot

     example    X:\Sources>bootrec /fixboot
     You should see: "The operation completed successfully."

i) Type command:  exit

     example    X:\Sources>exit

j) Click on "Turn off your PC"

    Wait for the computer to shutdown and switch off.

k) Remove Windows 10 install USB

l) Restart