If this doesn't work, see the page [[Manual SAM3U Firmware Update]] for details on how to manually enter bootloader mode. You can return to this page for the actual programming - you don't need to install/use the BOSSA utility if you follow those manual directions. You simply need to force the system into bootloader mode using those directions.
To actually program the file, we use the second part of the dialog box you already had open:
[[File:sam3uupdate.png|400px]]
Once we are in bootloader mode, you can follow these steps:
# Once completed, unplug/replug your device and it should come to life.
# Close the update widgets, and reconnect to your ChipWhisperer-Lite.
[[File:sam3uupdate.png|400px]]
==== Manual Update ====