Delphi DS100E (and its popular successor, the DS150E) is a staple for DIY diagnostics, but its firmware update process is notoriously finicky, often resulting in the dreaded "No VCI Found" error or frozen progress bars. The "No VCI Found" Hurdle

Select the correct COM port. If you are unsure which port to use, check your computer's Device Manager.

B. Incomplete Firmware Package

If the firmware file downloaded via the update manager was corrupted or interrupted during download, the VCI will attempt to write an incomplete package, leading to a "Memory Full" or checksum error.

Step 3: Factory Reset via Recovery Mode

Writing Flash...