When programming new JLR keys in an All Keys Lost (AKL) situation, many locksmiths wonder how the vehicle’s synchronization code is preserved. With Xhorse tools, the sync code is automatically maintained through the original MCU dump.
First, read the MCU data using a programmer such as Xhorse VVDI Prog. The original D-FLASH and EEPROM files already contain the vehicle’s cryptographic synchronization data that links the KVM/RFA, BCM, and ECU.
Next, load the original dump into the Xhorse Immo Data Tool. The software analyzes the file, locates available key slots, and preserves all existing synchronization information without modification.
When generating a new JLR key, the tool extracts the necessary rolling-code seed and sync data from the original dump and writes them directly into the new key transponder. A modified dump file containing the new key information is then created.
Finally, write the generated file back to the MCU. The vehicle retains its original synchronization with all modules, while the newly added key is recognized as a valid and fully synchronized key.
This process allows Xhorse tools to add new JLR keys while safely maintaining the factory sync code stored within the original dump.
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