1) flash the firmware

xzcat gentoo-unmatched-${VER}.rootfs.wic.xz | \
	sudo dd of=/dev/sdX bs=512K iflag=fullblock oflag=direct conv=fsync status=progress



2) account & password

For gentoo-unmatched-2021.10.27.rootfs.wic
  root:  - no passwd, empty
  riscv: plct1024!

For calculate-unmatched-2022.05.18.rootfs.wic
  root:  Riscv2022#
  riscv: Unmatch2022!