OOWOW can't start

Hello. I have vim4 with ubuntu installed. I want to install another system, but I can’t boot oowow. I’ve tried hold function key and short press reset. But there is nothing on the screen. I also tried methods from here: url.
But the result is the same. Is there any other way I can start oowow?

After you press the buttons in the proper order what is the LED doing?

This always works and have you tried it yet.

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can u provide more detail ! how its was before ?