Just to correct myself, as 68HC bits burn from 0 to 1, you
could, as per Bob's suggestion, over-write with FF, which
is STX,X and that would probably work. You may possibly
come unstuck with the timer and IRQ vector table though

But anyway, the good news for Emrah is that an OTP PIC
is re-usable

The choice of 00 for NOP and being able to over-write previous
contents with it seems like some pretty natty forward-thinking by
Microchip

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