Error: Can't access JTAG chain, Error: Operation failed when programming with the ByteblasterMV download cable - Error: Can't access JTAG chain, Error: Operation failed when programming with the ByteblasterMV download cable Description This solution only applies if the Hardware Setup field in the Quartus ® II Programmer lists "ByteBlaster" instead of "ByteBlasterMV" or "ByteBlaster II." To avoid these errors, perform the following steps after installing the Quartus II software: Reboot the machine Uninstall the sentinal driver Browse to the <Quartus II installation directory>/drivers location Double click the sentinal driver program, setupx86.exe Choose uninstall from the File menu Install the sentinel driver by choosing install from the File menu Another alternative is to program with the USB Blaster download cable, which does not cause this problem. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']