Prevent firmware downgrades #4195
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LGTM. Will merge soon unless anyone has objections. |
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There has been an optional criterion for many years on hardware wallet listings to avoid attacks by preventing the downgrading of firmware to a potentially vulnerable version. Some currently listed hardware wallets simply prevent downgrades while others allow the capability of the current firmware to prohibit the installation of specified versions.
I propose making this a required criterion. The original criterion was slightly reworded to take into account both implementations described above.