: Specifies the European Geographic Region (ECE). This indicates the core system language parameters, radio frequency spacing, and map configurations are optimized for European road networks. AU : Explicitly identifies the branding target as Audi .
The firmware is a specific stock software version designed for the Audi MIB2 Scale (MIB-HS) infotainment system, manufactured by Delphi . Installed across an array of mid-generation Audi vehicles—including popular models like the Audi A3, A4, A5, and Q5—this specific firmware string dictates how the car’s Multi Media Interface (MMI) communicates with navigation maps, smartphones, and local audio hardware.
(MU 0235) – Recommended
This string of characters can be broken down to reveal exactly what system your car is running:
You likely found this string in your vehicle's "Version Information" screen . Knowing this exact code is essential if you are: Updating Maps : To ensure you buy the correct Navigation SD Card for your specific hardware Activating Features Apple CarPlay Android Auto , which often require specific firmware levels or patches AliExpress Troubleshooting mhs2-er-au-p1240
: Requires entering the "Red Engineering Menu" (holding NAV up and RADIO down for 5 seconds) to verify current software compatibility.
Access the (usually by holding specific buttons like "Nav/Map" and "Media" simultaneously for several seconds). Select Update and choose the SD card source. Completion : The system may restart several times during the process.
Although the P1240 firmware was perfectly adequate when new, over time owners have reported a number of annoyances that are to P1242 or P2035.
If your Audi is running version (often paired with MU Software 0211 ), your infotainment system is capable of several modern integrations: : Specifies the European Geographic Region (ECE)
The string MHS2_ER_AU_P1240 is a software (firmware) version identifier used on , specifically the “MIB High Scale 2” (MHS2) variant, which Audi officially calls MMI Navigation (standard) . A breakdown of each part follows.
To resolve these stability issues, Audi released subsequent maintenance updates. The most direct and stable successor to the P1240 version is .
Inside you will find in the same nest — impossible otherwise.
Look for the line starting with "Software version" to see if it matches "MHS2_ER_AU_P1240". Updating and Modification The firmware is a specific stock software version
Stands for Europe, indicating this is for European-spec infotainment units. AU: Denotes Audi vehicles.
: This specific "ER" version covers 48 European and UK regions, including full support for 2024/2025 roadmap updates.
: Essential for stabilizing or activating Audi Smartphone Interface (CarPlay/Android Auto).
The navigation FEC (function enablement code) is stored in a protected part of the memory and is preserved across a firmware update. However, if you later update to a new map version that requires a different FEC, you may need to apply an activator or purchase a new map licence. This is independent of the firmware update.