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The problem is that this isn't an attack against a single chips unique code signing key, but against all RP2350 ever produced with this hardware revision. The problem can't be fixed in software. Now the attack doesn't require anything fancier than a hot air gun, and an interposer board to isolate the USB_OTP_VDD pin for glitching, and a pair of steady hands.

These are all operations that only need pretty cheap and available equipment, so I think you can't call it secure enough

The parameters of the challenge were apparently that you could do anything at all.