The number sequence "100 251" resembles part numbers for Delphi diesel fuel injection components (e.g., injectors, control valves, or ECU-related parts). "Rev 10" indicates a revision level of a hardware component. If you need a driver, it's likely for:
FTDI is the original manufacturer of the USB-to-serial chip inside most Rev 10 devices.
Steps:
This is common with SEO-spam sites. Scan with Malwarebytes or Windows Defender offline. Only use FTDI’s official site or Delphi’s login-protected portal. Never run .exe files from delphidrivers247[.]com or similar.
Two possibilities:
| Driver Version | Best For | Download Source |
| --- | --- | --- |
| FTDI v2.12.36.4 (New) | Genuine devices, Win10/11 | ftdichip.com/Drivers/CDM/CDM212364_Setup.exe |
| FTDI v2.10.00 (Legacy) | Clones or Win7 | ftdichip.com/Drivers/CDM/CDM v2.10.00 WHQL Certified.zip |
| Delphi Custom v4.2 | Commercial diagnostics suite | (Login required) delphiautoparts.com/en-us/my-diagnostics/drivers |
If after installing the new driver your Delphi 100 251 Rev 10 shows Code 43 (Windows has stopped this device because it has reported problems) , you almost certainly have a counterfeit FTDI chip. delphi 100 251 rev 10 driver download new
Some enthusiast forums provide an edited ftdibus.inf that disables the counterfeit check. We do not recommend this for safety reasons, but it exists. Search for "FTDI clone killer fix modded INF" – but verify the file checksums.