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TM4C129ENCPDT: Changing the MAC address on the chip

Part Number: TM4C129ENCPDT
Other Parts Discussed in Thread: UNIFLASH

I have inherited some circuit boards and the MAC address on two of the chips were the same.  I have the correct number but it is not overwriting the existing MAC address.

I tried different numbers and accidentally changed the MAC to 0-0-0-0-0-0.  Now I cannot get another number to overwrite that value.