I rebooted and e/Os did not start, but maybe the installetion worked…
So l went back to 3 steps and then…
And now !
so I rushed in doing this
Open Settings, and select “About” or “About phone”.
Tap on “Build number” seven times.
Go back, and select “Developer options”.
Enable “OEM unlock” option.
Scroll down, and check the “Android debugging” or “USB debugging” entry under “Debugging”.