Problem with firmware 4.0.0: "The following peripherals did not come online during boot" warning

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Okay. So maybe try this:

Hold down shift and eject and then power on for Prime 4. This will put it into firmware update mode. This will give you an image of an arrow going into a computer chip. Then it should be ready to start the update on your computer.

If this doesn’t work, I think that your local service centre will have to help.

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no solution yet. denon technical service without responding