Introducing the CAS4 Editor v1.0, a powerful and free software utility designed specifically for working with BMW CAS4 immobilizer systems that use the 1L15Y processor mask. This tool provides deep-level access to the module's data, allowing for advanced repairs, key management, and module synchronization that often require expensive specialized hardware.

Enhanced Feature Breakdown:

This editor goes beyond basic data viewing. Here’s a detailed look at what you can do:

• Edit Core Security Keys:
  • ECU Secret Key (SK/ISN): View and directly edit the ISN (Secret Key) that synchronizes the CAS with the engine control unit.
  • CAS Secret Key (SK): Directly edit the main 16-byte Secret Key of the CAS4 module itself. This is a critical function for advanced repairs and module cloning.
• Full Data Control:
  • VIN & Mileage: Change the full 17-digit VIN and correct the mileage value.
  • EGS ISN Sync: Edit the ISN for the electronic gearbox controller (EGS) to ensure proper synchronization.
  • Key Frequency: Change the operating frequency for the remote keys (e.g., 315, 433, 868 MHz).
  • Remote ID Editing: Modify the individual ID for the remote functions of the key.
• Advanced Key Management:
  • View the status of all 8 key slots.
  • Individually open and save data for each key, allowing for cloning or detailed analysis.
• Convenient Data Handling:
  • Export to TXT: Save all critical data (ECU SK, CAS SK, vehicle info) to a text file for your records with a single click.
  • Automatic Checksum Correction: The software automatically calculates and corrects checksums upon saving, ensuring the integrity of the file.

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Hardware & System Information​

Important: This Tool is ONLY for CAS4 with Mask 1L15Y

This software is specifically designed for the MC9S12XDP512 microcontroller with a 1L15Y mask set. It is NOT compatible with newer CAS4+ systems found in later F-series models, which use different hardware and encryption. Always confirm your CAS module's processor before using this tool.

System Requirements

• Operating System: This software was tested and confirmed to be working on Windows 10 Enterprise LTSC (2019). It is expected to be compatible with other versions of Windows 7, 8, and 10.

Compatible Hardware Programmers

To read and write the necessary EEPROM dump from the CAS4 (1L15Y) module, you will need a reliable BDM (Background Debug Mode) programmer. Commonly used and tested tools for this processor include:

• XPROG-M
• VVDI Prog
• Orange5
• Rosfar
• UPA-S (UPA-USB)

Disclaimer​

This is an expert-level tool. Incorrectly modifying SK or ISN data can render a vehicle immobile. Always create and verify a backup of your original EEPROM file before making any changes. The user is fully responsible for all actions performed with this software and must comply with all local laws regarding vehicle data modification.

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