The alphanumeric string represents a specific production firmware version for the Audi Multi Media Interface (MMI) navigation system. Found in several modern Audi models, this designation is critical for owners and technicians who want to troubleshoot system bugs, update navigation maps, or unlock modern smartphone integration features.

: Specifies the geographic market region. "ER" stands for Europe (often matching the broader ECE region), ensuring compatibility with European radio frequencies, language packs, and regional map databases. AU : Explicitly identifies the vehicle brand as Audi .

Do not turn off the ignition or remove the SD‑cards while an update is in progress. Interrupting a firmware flash can permanently brick the MMI unit.

This list is confirmed by MMI update providers and by Audi owner communities. A high‑resolution version string (e.g., MHS2_ER_AU_P1240 ) can be found in the car’s → Version Information screen.

If you choose to update your firmware or install the latest regional map data via an SD card, follow this standard installation protocol: Prerequisites

Audi’s infotainment software nomenclature follows a strict layout. Each segment of the code reveals essential details about the hardware manufacturer, geographic region, vehicle brand, and release status:

Audi dealers are not required to provide firmware updates free of charge unless the update is part of a safety recall or a specific warranty repair. Most dealers will charge several hundred euros for a firmware flash. The independent providers mentioned in this article offer the same official firmware files at a fraction of the dealer price.