Changes

The FPGA bitstream alone is what is normally configured by the ChipWhisperer-Capture software. This bitstream is always the most up-to-date, since it's automatically reloaded by the computer every time you power cycle the ChipWhisperer-Capture. The SAM3U firmware however is not automatically updated, but it tends to change less frequently.

The firmware version is printed at start-up. You will see a line that looks like this indicating the version of the SAM3U Firmware:

Note the main version is 0.11 in this example. The "b0" indicates a "build" number. Typically this will be "build 0", but special versions will use a different build number to indicate a variant of a regular version.

Before updating, you must put your ChipWhisperer 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.

# Close the update widgets, and reconnect to your ChipWhisperer.

There is an issue in some versions of Linux, where the SAM3U is not assigned a serial port when it enters bootloader mode. Here are some steps to resolve this issue (Note. this is not a permanent fix, you must go through these steps each time you put your ChipWhisperer into bootloader mode.). These steps assume you've already put ChipWhisperer into bootloader mode.

You should now be able to program the bootloader from ChipWhisperer Capture through the port you created

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.