It’s an Audi A7 equipped with an encrypted BCM2 (Body Control Module 2) module, identified by the 4H0 part number prefix. Modules starting with 4H0 are usually encrypted BCM2 modules。 This BCM2 module contains an MCU chip, the D70F3634, which adds an extra layer of security.
Our engineering team attempted to clone this module using Xhorse MULTI PROG.
Attempt 1: Using Xhorse First-Generation Audi BCM2 Adapter
Install the BCM2 solder free adapter, connect the adapter with multi prog. Also need to connect 12V power supply to the BCM2 green connector.
With the first-gen BCM2 adapter, multi prog read the module’s ID. While the adapter successfully detected the module, it returned an error indicating that the chip was encrypted and could not be decrypted. This confirmed that the older adapter lacked the necessary decryption capabilities and could not clone an encrypted BCM2 module.
Attempt 2: Using Xhorse Second-Generation Audi BCM2 Adapter
Next, we switched to a new second-generation BCM2 adapter. The new BCM2 adapter is easier to install. Don’t need to 12v power supply.
New BCM2 adapter features enhanced functions, including:
Encryption/decryption support
Full data cloning capability
Using this upgraded tool, we were able to:
Read the module ID successfully.
Read D-Flash and P-Flash data without issues—though reading P-Flash took slightly longer due to its size.
Write the complete cloned data back to a replacement module.
The second-generation BCM2 adapter proved effective in cloning the encrypted BCM2 module, overcoming the limitations of the older version. This confirms that with the right tools, even secured modules like the 4H0-series BCM2 with D70F3634 PCU chip can be successfully duplicated.
This breakthrough ensures efficient module replacement and repair processes for Audi A7 vehicles with encrypted control units.
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