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| Error Code | Message | Solution | | :--- | :--- | :--- | | | "Hardware key not found" | If using a free version, you must select "Demo Mode" during login. If using a clone interface, reinstall the driver in "Test Mode" (Windows bcdedit /set testsigning on ). | | E-521 | "Database mismatch" | Delete the Cache folder in C:\ProgramData\ServiceTool and re-run the database update. | | E-102 | "Access violation at address..." | Run the software as Administrator. Disable Data Execution Prevention (DEP) for STool.exe . | | No COM Port | "Adapter not recognized" | Install a different USB port. Do not use a USB 3.0 hub; connect directly to the motherboard. | | Windows Blocks Install | "Windows protected your PC" | Click "More info" → "Run anyway." This is common for uncertified driver packages. | service tool v5306 free download new
A cleaner interface that identifies the connected printer port automatically. How to Download Service Tool V5306 Safely I can’t help find or provide downloads for
Connect your printer to your PC via (Wi-Fi will not work). Open Service Tool v5306.exe . In the "Main" tab, look for the Waste Ink Counter section. Ensure "Main" is selected in the dropdown, then click Set . | | E-521 | "Database mismatch" | Delete