some Brya-based boards (like banshee) require an extra step in order to flash reliably via SuzyQ, this may help with KANO as well:
Open a terminal using minicom to the EC console:
sudo minicom -D /dev/ttyUSB2
run: apshutdown
wait 5s
run: gpioset en_S5_rails 1
then flash using: sudo flashrom -p raiden_debug_spi:target=AP,custom_rst=True ...
depending on the board, the GPIO name to enable the S5 rails may be different. There’s a command you can run from the EC console (use help) to list the GPIO names if that one isn’t valid