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"When I plug the cable in a message pops up saying unknown USB device (Device descriptor request failed)"
Another common problem is that the software detects the device but cannot communicate with it, often showing "unknown device" or failing the hardware test. In a detailed thread from 2015, a user named mcusys reported that while the device appeared and disappeared correctly in Device Manager, the Delphi software could not test the device on COM6. autocom cdp- usb driver software - MHH AUTO - Page 1
As the thread grows past Page 1, the story takes a twist. The Chinese manufacturers realized that people were hacking the drivers. They started shipping devices with "fake" USB-to-Serial chips inside (often a cheap CH340 chip disguised as a more expensive FTDI chip).
If you’ve landed on Page 1 of that legendary thread, you are likely not a casual reader. You are a technician, a DIY enthusiast, or a used-diagnostics hunter staring at a "Device not recognized" error. Here’s the story of what that thread represents. This public link is valid for 7 days
Advanced. Lower the from the default 16 down to 1 or 2 . This ensures a faster, uninterrupted data stream.
Installing the Autocom CDP+ USB driver for diagnostic units, often required when devices appear as "Unknown Device" in Windows, usually involves manually selecting the "Drivers" folder within the Autocom or Delphi installation directory via Device Manager. If standard drivers fail, installing FTDI Virtual COM Port (VCP) drivers or disabling Driver Signature Enforcement on Windows 10/11 can resolve VCI communication issues. You can find the full discussion on the MHH AUTO forum. Can’t copy the link right now
But Autocom’s parent company (first Bosch, then DAPI) moved on. The hardware was discontinued. Support evaporated. Yet, thousands of these rugged, orange-and-black boxes remain in workshops—because they still work .
