is a comprehensive software patch and utility suite designed for the Mercedes-Benz Xentry (XDOS) diagnostic system. Released to address common limitations in the December 2021 (2021.12) version, the V3 fix is essential for independent workshops and technicians who need full, offline diagnostic and programming capabilities for Mercedes, Smart, and Maybach vehicles. Key Features and Improvements in V3
It includes protections to prevent the diagnostic hardware (such as MB Star C4, C5, or C6) from being blacklisted by the software, resolving the common "DAS 870" error.
Includes "DAS Standalone" and "DAS SIM" fixes, along with the restoration of "DAS Special Functions" and "DAS Prototypes," which are often hidden in standard versions. Fullfix-xentry-2021-12 V3
You must disable Secure Boot in your laptop's BIOS before starting the installation.
The 2021-12 software, when applied with the Fullfix V3, is widely compatible with various diagnostic multiplexers and vehicle models: is a comprehensive software patch and utility suite
Ensure your laptop meets the minimum storage requirements (ideally an SSD) to handle the large diagnostic databases.
Windows 10 (Pro/Enterprise) is mandatory for this version. Includes "DAS Standalone" and "DAS SIM" fixes, along
The Version 3 (V3) update provides several critical patches that allow the software to operate efficiently without the restrictive requirements typically found in standard OEM installations:
Antivirus software should be disabled during the patch application to prevent files from being quarantined.