USB Blaster II shows as Cypress FX2LP No EEprom

Which Cyclone V Soc Kit? this one (https://www.altera.com/products/boards_and_kits/dev-kits/altera/kit-cyclone-v-soc.html)?

Could you have inadvertently erased the MAX II device, that forms part of the USB-Blaster solution? This CPLD can be used as the EEPROM for the Cypress part giving it's PID/VID - telling it it's a USB-Blaster.

Alternatively, you've erased the Cypress device's internally stored descriptors (more likely), telling it it's a USB-Blaster. Assuming this case, Cypress will have a utility for programming these internal registers (as FTDI do, whose devices are used in other USB-Blasters), although I've never used the Cypress utility. Final hurdle, you'll need the set of values to program back into the Cypress part - which you're only likely to get by reading them out of a known good board. Confirm which board you're using and I may be able to provide these.

This link may be the right cypress utility (http://www.cypress.com/documentation/software-and-drivers/cy4618-and-cy3685-ez-usb-nx2lp-programming-utility-software). Download it and see if it can identify the Cypress device on your board.

Cheers,

Alex