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When talking about the ChipWhisperer-Lite's firmware, there is really two parts to this:
# The FPGA Bitstream file.
=== Upgrading Firmware ===
Before updating, you must put your ChipWhisperer-Lite into bootloader mode. Once put into this mode you will need to load a new firmware file. There is two ways of doing it: the ''automatic'' method, and the ''manual'' method. The automatic method is done through the GUI, and works if you have valid firmware image loaded. The ''manual'' method is always guaranteed to work.
The automatic method is:
Using ChipWhisperer-Capture GUI
# Connect to the ChipWhisperer-Lite.
# From the ''Tools'' menu select ''Config CW Firmware''
# Select the ''Open SAM3U Update Widget'' button.
# Press the ''Enable Bootloader Mode'' button.
# You will get an error, and the ChipWhisperer-Lite will disconnect. This is normal, and indicates the USB mode changed suddenly.
# The blue LED will stop flashing, and the device will reconnect in programmer mode (see below).
# Hit the "Run Program" button
# Once completed, unplug/replug your device and it should come to life.
# Close the update widgets, and reconnect to your ChipWhisperer-Lite.
=== Manual Update ===
If the above instructions fail, there is no big problem. The SAM3U chip contains a hardware-resident bootloader. You may need to follow instructions on the [[Manual SAM3U Firmware Update]] page (including using BOSSA) if you are unable to use the automatic system that is part of ChipWhisperer-Capture.