USB-Blaster not recognized

[yyabe]

I use a DE0-CV.

As you can see in the attached image, when writing from Quartus II, the USB-Blaster is not recognized anymore.
The USB-Blaster was recognized fine for a few days, but yesterday it suddenly stopped being recognized.
Immediately after rebooting the PC, the USB-Blaster is recognized.
However, the Altera USB Blaster is always visible in Device Manager.

The version of Quartus I tested was 17.1.0 and 18.1.0.
I have the same symptoms on two different computers(Windows10 64bit).

I look forward to hearing from you.

[NurAiman_M_Intel]

Hi,

Thank you for contacting Intel community.

Please check below:

1. Ensure that USB Blaster Adapter connected to the board in correct manner(one to one mapping)
2. Check with the same USB Blaster with another system
3. If possible try with another USB Blaster with same system.
4. Refer to USB Blaster userguide

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_usb_blstr.pdf

Additionally, try to use Quartus 18.1.1.

Regards,

Aiman