How to enter USB expert mode LG TV

Does anyone know how to enter USB expert mode on modern OLED LG TV (pref 2019+)

Either on the settings page (there used to be a way of pressing 7 or Fav x7 times to bring it up) or with the engineering menu.

If you go into the engineering menu, USB expert is greyed out and cannot be changed, so I am guessing there is a keypress needed?

I need to use it to downgrade a firmware (yes I know, leave it alone...its a long story)


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