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Found a way to upgrade the current firmware over USB by an end-user (http://elmorlabs.com/index.php/2014-05-15/all-devices-now-ship-with-upgradable-firmware/). There's no need for hardware changes but the devices already shipped out would need to be upgraded with an Atmel AVR compatible programmer. This will be useful for bug fixing and eventual feature additions. For example I've been contemplating adding an I2C sniffer function in order to help reverse engineering software behavior and increase voltage limits. If you're coming to Computex and want your device upgraded just let me know!