Scott
I am sorry that you are having difficulties with the SD card. It really is a simple, yet great enhancement to the Technics keyboards.
I, and the overwhelming majority of the KN7000 owners in the USA have not bothered to upgrade their OS. Why, because it wasn't worth the bother and risk of freezing up their board. All you gain is an accurate usage meter.
I advise to forget the little 8MB card, and get a 128, or 256 card. As long as it is SD,and you are not using Jukebox,any brand is fine. I don't save audio files, so I run out of files before I run out of capacity. Then, you need not worry about the amount used being wrong.
Best regards
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact