USB Blaster has stopped working

[SBrow5]

I am running Quartus 16.1 standard on Windows 10, and have been debugging my firmware with SignalTap II connected through the USB-Blaster.  This has worked fine up until last night when it could no longer find the device.  I've tried different boards, I've tried a different USB blaster.  Nothing works.  If I go to the programming tool and debug the JTAG chain it shows the expected device (Cyclone V SX) and an unknown device.  It seems to be misreading the SOC?  What could have changed?  I've tried installing v20.1 but that USB Blaster driver won't install.

Any clues?

[NurAiman_M_Intel]

Hi,

Thank you for contacting Intel community.

That might be due to issue with USB Blaster. Kindly follow the workaround in KDB below (it is also applicable for USB Blaster):

https://www.intel.com/content/altera-www/global/en_us/index/support/support-resources/knowledge-base/tools/2021/why-does-the-intel--fpga-download-cable-ii-driver-installation-f.html

Thanks.

Regards,

Aiman

[NurAiman_M_Intel]

We do not receive any response from you to the previous answer that I have provided. This thread will be transitioned to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you