Audi Magneti Marelli MM4 - ECU Checksum Correction Tool 1.1

New release thread for Audi MM — Magneti Marelli MM4 (HC912) Cluster EEPROM Service & PIN Helper: discuss, share feedback, and get help.

Audi MM — Magneti Marelli MM4 (HC912) Cluster EEPROM Service & PIN Helper​#

Open dump, read old km & PIN, set new mileage with auto-checksum, then save.

Audi MM 1.1 — service tool for Magneti Marelli MM4 (HC912) clusters
A compact Windows utility designed for workshops working with Audi Magneti Marelli MM4 instrument clusters based on the HC912 MCU. Load an EEPROM/MCU dump, view the Old km, enter the New km, and save a corrected file with checksums handled automatically. The tool also displays the Immo PIN extracted from the dump to speed up coding and adaptations.

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Frequently Asked Questions​#

Which Windows version is recommended?
For maximum stability during ECU flashing and diagnostics, a clean installation of Windows 10 (64-bit) is recommended.
Is it compatible with J2534 PassThru?
Most modern software versions support standard J2534 interfaces like Scanmatik 2 Pro, OpenPort 2.0, and specific VCI adapters.

What's inside:

• Overview & screenshots
• Version history and compatibility
• Download link and setup notes

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