Reset Windows 10 password without utilman.exe

• Boot from the Windows installation disk/USB stick with Windows setup.
• Wait for the “Windows Setup” screen:
  

• Press Shift + F10 keys together on the keyboard. This will open the command prompt window:

• In the command prompt, type regedit and press the Enter key. This will open Reg Editor
  

• Select HKEY_LOCAL_MACHINE key on the left.

• After you select it, run the File -> Load Hive… menu command.

• In the load hive dialog, select the following file:

DRIVE:\Windows\System32\config\SYSTEM

1. Enter any desired name for the hive you are loading. For example, I gave it a name 111:
2. Go to the following key:HKEY_LOCAL_MACHINE\111\Setup

• Edit the cmdline parameter and set it to cmd.exe

• Change the SetupType DWORD parameter value to 2.

• Now select 111 on the left and run the File -> Unload hive menu item in Regedit.

• Close Registry Editor and all open windows.
• Reboot Windows and you will see the following command prompt at boot:

• Type “net user”
• Use the a current administrator account to reset password with the following command:
• net user ‘username’ ‘newPassword’
• e.g. net user chris apples123

• Type “regedit” to open Regisry Editor.
• Go to the following key:HKEY_LOCAL_MACHINE\System\Setup
• Edit the cmdline parameter and set it to the empty value.
• Change the SetupType DWORD parameter value to 0. See this screenshot:

• Close that off and reset the power on the PC and next time you log in with that account use your new password.

Source ” https://winaero.com/blog/reset-windows-10-password-without-using-third-party-tools/ ”