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Okay. It would be a lot of work, but might be fun if you're bent that way.
You would probably need to load new modules built and installed by you. For that you need root privileges, so you wouldn't be able to update to the latest firmware versions (they haven't been rooted yet). It's possible that the USB hardware in the reader has OTG capabilities and could be put into host mode. If it's possible and you accomplished that, then you could build more modules for supporting other USB devices. Even then, who knows if the reader can power the plugged in USB devices, and if so, how long the battery would last doing it. Remember that it only charges by the USB port, so you couldn't charge and host another device at the same time.
Speaking of power, the device is able to go for weeks without a recharge because it is very aggressive at going into sleep mode when you aren't interacting with it (via buttons and stylus). If you're constantly running something on it (e.g. music player), you will have to recharge way more often. Maybe the reader isn't the right device for what you want to use it for. I don't want to keep you from trying, as it seems like a very interesting project, but I want you to be realistic about the outcome.
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