I have a Wi-Fi adapter based on the rt2870 chip. I had a similar error, it detected the card but said it couldn't find rt2870.bin. I downloaded this bin file from the kernel git repo, placed it in /lib/firmware/rt2870.bin and was able to connect using the same wpa_supplicant.conf and interfaces file. I suspect if you find the firmware for your device and place it in the correct location it should work.
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