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HP DesignJet Z6200 60-in Photo Printer

I bought a DesignJet Z6200 which has a very old, possibly original, firmware on it (KHN_01_00_07.1.fmw). I tried installing the newest available firmware online (KHN_03_07_07.1.fmw). I used the same USB that came with the printer so I assume that it's formatted properly. It's starts the process and starts reading off the USB. after maybe 45 seconds, it asks me to remove the USB and shortly after, I get a "USB flash drive does not contain a valid firmware file" (see attachment). Any ideas on how to proceed or what's going on?DoesNotContainValidFirmware.jpg 

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