You'll need at least an electron microscope... but defeating MCU readout protection using a FIB is actually a thing: https://www.eag.com/services/engineering/f

You'll need at least an electron microscope... but defeating MCU readout protection using a FIB is actually a thing: https://www.eag.com/services/engineering/fib-circuit-edit-debug/ https://www.eag.com/services/engineering/fib-circuit-edit-de... Costs are what you'd expect for something of this nature.