> Every chip can be hacked... internet hackers can't turn on physical switches...
Others have replied to the specifics here, but I'd like to add that "every chip can be hacked" is just categorically false (unless you also allow for physical access for "hacked", but then that would apply to the physical switch as well).
"Chips" are neither magical devices, nor are they necessarily running something akin to software, or controlling everything purely through software even if they do.
As a simple example, you can be very confident that a (real) ROM is a ROM, and that its contents cannot be changed by software.
Others have replied to the specifics here, but I'd like to add that "every chip can be hacked" is just categorically false (unless you also allow for physical access for "hacked", but then that would apply to the physical switch as well).
"Chips" are neither magical devices, nor are they necessarily running something akin to software, or controlling everything purely through software even if they do.
As a simple example, you can be very confident that a (real) ROM is a ROM, and that its contents cannot be changed by software.