Cannot re-enable usb debugging

I have set the switch off in anti-theft. Options still greyed out in android settings.

Rebooted. Options still greyed out in android settings.

Removed anti-theft as device manager. Options still greyed out in android settings.

Rebooted. Options still greyed out in android settings.

Uninstalled anti-theft. Options still greyed out in android settings.

I need usb debugging to be switchable so I can use Titanium to back up my phone.

Not happy.