(e.g., WinOLS, Xhorse, BitBox) are you using when this error appears? How do you fix missing dll files on Windows 11?

Open your Antivirus/Windows Security history. Check "Quarantined Items" or "Protection History." If you find edc17.dll , select it and choose Restore or Allow on Device .

Ensure your drivers are up to date.

Select , choose Folder , and select the installation directory of your tuning software.

If you'd like, I can help you find a or provide steps to disable Windows Defender for that specific folder. Let me know which software version you are currently using!

Restart your computer after installation to apply system changes. 3. Reinstall Hardware Interface Drivers

Re-enable your antivirus after you have set up the folder exclusions detailed in Step 1. Summary Troubleshooting Checklist Action Item Why It Helps Prevents antivirus from locking or deleting edc17.dll . Update Visual C++ Packages Provides the mandatory Windows runtime environment. Reinstall USB/Interface Drivers Establishes the communication path from DLL to hardware. Toggle Admin Privileges Overrides Windows background permission restrictions.

Delete any residual folders left behind in C:\Program Files or C:\Program Data . Temporarily disable your antivirus software.

I can provide the specific or registry fix once I have those details.

Once you resolve the error, follow these guidelines to avoid recurrence:

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