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In the final part of this series, I complete the all keys lost process on a 2016 Subaru Crosstrek by accessing and reading the EEPROM inside the BCM to extract the immobilizer data.

This allows me to:

Identify the correct EEPROM chip

Use a programmer to read the memory

Write transponder data to a new key

Reinstall the BCM and verify full function

This is a full deep-dive into EEPROM-level key programming—a must-know skill for any advanced locksmith or auto tech.

▶️ Part 1: BCM Removal
▶️ Part 2: Lock & Key Bitting Decode

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