Delphi Autocom Windows 11 May 2026

When you plug a Delphi Autocom (CDP, CDP+, or 2.0) into a fresh Windows 11 machine, nothing happens. Why? Microsoft killed the old trust. Windows 11 enforces Driver Signature Enforcement (DSE) for kernel-mode drivers. The original Delphi drivers (circa 2008-2015) use an old certificate that Microsoft no longer trusts.

The Interesting Hack: You have to enter "Test Mode." This is Windows’ secret backdoor for developers. By running bcdedit /set testsigning on, you tell Windows 11 to ignore driver signatures. Suddenly, that red "Driver failed to install" turns into a yellow warning, and your Autocom comes back from the dead. Delphi Autocom Windows 11

While most modern software is 64-bit, the Autocom hardware interface relies on legacy 32-bit kernel-mode drivers. Windows 11 still supports these, but only if Secure Boot and Memory Integrity (Core Isolation) are disabled. By default, Windows 11 blocks unsigned or legacy drivers outright. When you plug a Delphi Autocom (CDP, CDP+, or 2

  • Disable Driver Signature Enforcement (permanent via BCDEdit): 
    bcdedit /set testsigning on
bcdedit /set nointegritychecks on
    Note: Re-enable after installation for network security.
  • Install required VC++ runtimes (2005–2022 x86/x64).

    • Windows 11 rejects unsigned drivers from most cloned Autocom interfaces (PID 0403, VID 14B0). The legacy FTD2XX.dll and autocom.sys are not signed with SHA-256. Note: Re-enable after installation for network security

    The Delphi Autocom CDP+ (Common Diagnostic Platform) hardware interfaces with vehicles via USB and requires proprietary drivers and a software suite (e.g., Delphi Autocom CARS 2015 or DPS 2019). Windows 11 introduces stricter driver signature enforcement (SHA-2 only) and enhanced security virtualization (HVCI), which often disrupts older, unsigned drivers required by clone hardware or original units with outdated firmware.