Thanks for the quick reply, and the good explanation. Makes sense now, almost.
But why does it need all three? If 'vendor id' and 'product id' are what the names sound like, shouldn't they be enough to identify the device, at least well enough to tell Calibre to attempt an Android interface?
The firmware, custom or stock, don't change the interface, which is just a mounted USB drive, right?
And if I'm way off base here, is there some way that I can modify my own driver, and post it to the large community of Android users that choose to use custom builds?
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