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Read the 9S12XDP512 or 9S12XEP100 EEPROM using a programmer.
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Load the EEPROM dump in the Tag software and choose a position where you would like to write the new key.
- Place a new key in the PROTAG programmer and press the “Prepare key” button.
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The software will modify the dump and the user should save it to a new file.
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The modified dump needs to be written back to the Motorola MCU in the D flash section and the car will start.