The USB-Blaster II may not be detected if there is a conflict between the USB-Blaster II driver and other 3rd party drivers on your PC.
If your USB-Blaster II is not detected when running jtagconfig from the command line, you should inspect the Windows Device Manager.
If there is a conflict with a different USB driver:
- The Altera® USB-Blaster II (Unconfigured) device is shown with a warning symbol in the Windows Device Manager
- The device status pane of the properties window for the Altera USB-Blaster II (Unconfigured) device displays (Code 38).