Best thing to do is have it replaced by a reputable company that swaps EEPROMs.
All other options are pricey and will leave mismatched VINs and mileage (VIN is also in the cluster and climate control unit). Like Woody said, you can do it, but it's overkill and you'll have unmatched parts.
A repair shop that knows what it's doing will remove the EEPROM containing the car's VIN and stored keys from your old unit and put it into a new immobilizer, saving you a lot of trouble, work and possible issues down the road.
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