Why is my USB Blaster II not detected by Quartus II on Windows? - Why is my USB Blaster II not detected by Quartus II on Windows? Description 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). Resolution To resolve this problem, the USB device that is in conflict with the USB-Blaster II should be unplugged. Many computers also use USB to communicate with built-in peripherals such as SD card readers. These devices may be disabled using the Windows Device Manager. This problem is scheduled to be resolved in a future release of the Quartus® II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.1.2 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']