In this post, we’ll show you how to use OBDSTAR DC706 programmer with c4-09 adapter kit read and write encrypted data from an Alfa Romeo BCM-specifically, the Fujitsu MB91F526 MCU. The BCM model is BCM949.20 L10.
Standard Operating Procedure
Step 1: Enter the brand/system menu on the DC706, use the top-right quick search box, and input “949” to locate BCM949.20 L10.
Step 2: Select BDM Mode (case must be opened) and pair the MP001 programmer.
Step 3: Open the Guide to review warnings, menu explanations, connection details, and special notes—align the team before touching hardware.
Step 4: Tap [ECU Image] to visually confirm the module to avoid mixing up variants or boards.
Step 5: Open PCB Pinout, identify solder pads, complete clean soldering, then double-check each joint for cold solder or bridging.
Step 6: Clearly distinguish between the two harnesses: W006 (decryption signal only) and W004 (data read/write after decryption). Keep them physically separated to minimize signal interference.
Step 7: Apply proper ESD protection. Connect through the C4-09 adapter and only power on after verifying the final wire sequence.
Step 8: Allow the device to enter the decryption phase. Do not move, press, or twist any wires. Duration varies—typically several to a dozen-plus minutes.
Step 9: Once decryption succeeds, the interface grants full access (right panel fully lit). You may now read/write Flash and EEPROM.
Step 10: Read and save the Flash first. Use a structured naming convention (e.g., vehicle_VIN_date_flash.bin).
Step 11: Read and save the EEPROM to form the second essential baseline backup.
Step 12: If immobilizer data handling is required, import the saved EEPROM file. The system can parse VIN, serial number, hardware ID, and PIN (authorized purposes only).
Step 13: (Optional Integrity Check) Rewrite the same EEPROM file to verify consistent communication and file integrity.
Step 14: For cloning, on the replacement BCM write the original Flash first, then the original EEPROM. If a “verification not supported” notice appears, proceed—this can be normal for certain models.
Step 15: After both writes complete, BCM operational data and immobilizer content have been migrated. Power down, carefully remove wiring, clean residual solder if needed, and reassemble the housing.
Know more info, turn to this video:
How to Program Alfa Romeo BCM949.20 L10 Using OBDSTAR DC706
Soft Close
The OBDSTAR DC706 combined with the C4-09 adapter brings structured, visual, and reliable workflow standards to BCM service operations. From guided connection to clean data cloning, every step is engineered to elevate professional efficiency while safeguarding compliance and hardware integrity. Precision comes from disciplined process—and the right tools.
Leave a Reply