How to Boot to BIOS on Steam Deck
To boot the Steam Deck to BIOS, power it off, then hold the volume up button while pressing the power button. Keep holding the volume up until the BIOS menu appears.
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Easy peasy! Just hold the volume up button and press the power button. Keep holding volume up until you see the BIOS screen.
Press volume up and power button simultaneously. That's it.
From personal experience, turn off your Steam Deck, then hold volume up while hitting the power button. Keep holding until BIOS shows up!
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