How do I change or reset my parental control PIN code?
Press Quick settings > Navigation keys up > Channel > Parental Controls and press OK, then enter your current PIN code if required. Select Change PIN and press OK, then enter your current PIN code followed by your new PIN code. Press EXIT to close the menu when done.
From the official Sony WH-1000XM5 Wireless Noise-Canceling Headphones manual, page 9
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