Unfortunately, Usb OTG is currently not supported by the onyx firmware. It used to be about a year ago or so, but apparently they disabled it because of reasons (booxtor mentioned at some place in the forum). There was talk of reactivating the feature (people were/are annoyed tsar they cannot use usb keyboards) or at least enabling the option of switching it on or off, but I haven't heard anything about that since.
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