Nios II Evaluation Kit Cyclone III Edition Usb Blaster Not Detected

To detect the Dev Kit hardware as USB Blaster, these conditions must be met, I think:

- The USB related hardware must be oprational and connected to USB

- The board ust be powered and the EPM3128 have a configuration, that sources 6 MHz clock to FT245

- The 93C46 EEPROM must contain the correct configuration. Cases have been reported, where a Dev Kit lost the FT245 configuration and was detected as a USB to serial adapter instead

- The driver must be installed

So in addition to what you alredy did, you could check for unexpected serial adapter. If it is detected as such, it may be a lost configuration or a driver issue.

You can also check, if a 6 MHz clock is present at R42 and C35.