Windows Tablet - Forgotten Password

I did the classic thing - set up my new Windows 10 tablet with a local password and then promptly forgot it! After trying a few hundred random passwords I set about hacking back in. The business with booting from a separate copy of Windows 10 is required because a normal Windows reset or access to the command prompt on booting requires knowing the user password.

1. Plug a USB hub into the USB port
2. Plug in a keyboard and mouse
3. Plug in a bootable memory stick with Windows 10 on it
4. Hold down the Shift key whilst clicking Reboot
5. Select Troubleshoot -> Advanced options -> UEFI Firmware Settings, then Restart
6. Use the keyboard to navigate to Security -> Secure boot menu and turn off secure boot, then Save and Exit
7. After reboot, hold down the Shift key whilst clicking Reboot
8. Choose Use a Device -> UEFI:Removable Device and select the memory stick
9. In the Windows 10 install dialogue, select Repair your computer
10. Click Troubleshoot -> Advanced Options -> Command prompt
11. In C:\Windows\System32 rename utilman.exe to utilman.bak
12. Rename copy cmd.exe to utilman.exe
13. Reboot and click the Utility Manager icon on the login screen
14. In the command window, reset the password (net user <username> <password>)
15. Test the login
16. Repeat steps 3-6 and reset the filenames in C:\Windows\System32 (delete utilman.exe, copy utilman.bak to utilman.exe)
17. Make a note of the password!!