EP2AGX125EF35 // Arria II GX FPGA Development Kit v9.0.2 // QuartusSetupWeb-14.0.0.20

Refer to the overview for the arria ii device family (http://www.altera.com/literature/hb/arria-ii-gx/aiigx_51001.pdf) document for a full description of the product markings.

The part number you've specified in your post is missing the speed grade information that is present on all the manufactured parts. 'EP2AGX125EF35' needs some additional characters after it - such as 'C5'.

There may also be an additional 'N' for lead-free, but Quartus doesn't care about that.

Quartus needs to know the this for the particular device fitted. So, it's expecting a part number with the 'C5' (or similar).

I don't have Aria devices installed on my installation of Quartus, so I can't check. If you're still having trouble let me know and I can easily add them to my installation.

Regards,

Alex