| Error Message | Solution | |---------------|----------| | "Setup cannot find GX Developer" | Install GX Developer or GX Works2 first. Configurator-MB is an add-on, not standalone. | | "File corrupted" | Redownload from official site. Use 7-Zip (not Windows native unzip). | | "Runtime error 53 - File not found" | Your antivirus deleted mbcomm.dll . Reinstall with AV disabled. | | "Module not supported in this version" | Your QJ71MB91 firmware is too old. Update module firmware or use Configurator-MB v1.21+ |