About rewrite of minimonitor
Even though you performed "3. Power on the board" of "Flashing firmware" and power on the board by pushing SW8,
if minimonitor does not start up, there is a possibility that the minimonitor of QSPI - FLASH has disappeared I think.
Where can writeinformation for minimonitor rewrite (SCIF mode boot loader and minimonitor) be available?
Is it possible to solve by using v302.zip linked to Kingfisher's page ?
https://elinux.org/R-Car/Boards/Kingfisher#How_to_update_of_Sample_Loader_and_MiniMonitor