Windows updates can reset driver settings, re‑enable security features (like DSE or Memory Integrity), or overwrite driver files.
If you find the installation process too complex or you want a more robust solution for sharing or emulating hardware dongles, consider these alternatives.
Right-click your problematic MultiKey entry (marked with a yellow exclamation point) and select . Virtual Usb Multikey Code 39 Windows 11
Here is how you can resolve this issue and get your virtual dongle working again. Why Code 39 Happens on Windows 11
Follow these solutions in order to bypass the security blocks causing the Code 39 error. 1. Disable Core Isolation (Memory Integrity) Here is how you can resolve this issue
Windows 11 includes a feature called Core Isolation that prevents "unsigned" or "insecure" drivers from loading. This is the #1 cause of Code 39 for MultiKey. Open (search for it in the Start menu). Go to Device security > Core isolation details . Toggle Memory integrity to Off . Restart your computer. Check Device Manager to see if the error persists. 💻 Step 2: Update or Reinstall the Driver
If you have exhausted all troubleshooting steps, consider switching to a network‑based sharing solution (e.g., FlexiHub or Donglify) or contacting the software vendor to inquire about a modern licensing alternative. Windows updates can reset driver settings
If you absolutely need to run a Multikey-emulated device on Windows 11, here is the general process (as shared by legacy hardware communities):
Test the scanner with its software or any text editor/notepad to verify it works.
Windows 11 mandates that all drivers have a valid digital signature from Microsoft. Multikey drivers are often unsigned.