: Many users report that disabling Wi-Fi/Internet before opening the software prevents "Invalid Serial" or "VCI Not Found" errors caused by automatic online checks. Hardware Rework
The DS100E needs a steady 12V supply (usually from the car) to update. delphi+ds100e+firmware+update+problem+top
Open on your PC and locate the "Unknown Device" or "USB Serial Port" associated with the Delphi unit. : Many users report that disabling Wi-Fi/Internet before
The update process says "Success," but when you open Delphi Diagnostics (e.g., version 2015 vs 2020), the software either crashes immediately or shows "Interface not compatible." version 2015 vs 2020)
Connect the VCI. It should appear under as "VCI (Diagnostic Unit)" or similar.