The UTILMAN.EXE trick to get in still appears to work.
So many pages on the web about that like https://www.passfab.com/windows-10/create-a-new-administrator-account-without-login-windows-10.html
From the category ''No you didn't!'' I disabled my Adminstrator Win 10 Pro account and now all I have left is a standard user account.
My goal: re-activate Administrator
1) logging-in safe mode and activating it. // This works, I can activate it this way... except when I log back into windows (regular mode) it's still disactive.
2) booting from windows media on a USB key and opening a command prompt. / Regedit / Hkey local machine / rem_sam / changing 11 to 10 on line 003 **but It's already a 10. (didn't have to do anything.
3) net user administrator /activate:yes > I obtain confirmation of successful action; yet again the same, when I log in back to Windows, > It's still disactive
Out of options / please help.