I asked in the Calibre Devices forum. Calibre matches USB devices using the vendor id and the device id codes. Unfortunately PB does not use a vendor id that is registered to them, so PBs look like very generic devices and consequently Calibre can't distinguish them. Maybe PB's Android devices are better.
It actually doesn't make any difference; the generic driver will work fine. Calibre just copies files, and doesn't care about resolution or colours etc.
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