What is the best way to manage software updates if the FT51A is out in the field?

The FT51A can provide a USB DFU interface, meaning that if you connect the USB device controller to a PC, you can use some simple software to update the firmware over USB, meaning that additional programming hardware is not required.

The “blank” chip Bridgetek ship includes a DFU code programmed. However example source code is available to allow users to add this DFU interface to their application code.