pressing 'OK' is not going to cut it. It would need to be an entry buried in the printer menu, 'apply downloaded firmware update'.
Of course, that additional hassle would reduce the likelihood the firmware would get applied, and the great majority of users, who want HP to own their printer problems, would be disserved.
Maybe a hybrid makes sense: the printer will take HP-signed updates automatically, but a difficult menu option lets you apply an unsigned update. Or change the signing key.
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