It worked when I tested last. The question is which chip is assumed for which adapter. There is a dedicated R2C bootloader available, can you try that one:
apt update
apt install linux-u-boot-nanopi-r2c-current
. /usr/lib/u-boot/platform_install.sh
write_uboot_platform "$DIR" "$(lsblk -npo PKNAME "$G_ROOTFS_DEV")"
reboot
If it doesn’t work, probably the edge kernel and bootloader does:
apt purge linux-u-boot-nanopi-r2c-current
apt install linux-{image,dtb}-edge-rockchip64 linux-u-boot-nanopi-r2c-edge
. /usr/lib/u-boot/platform_install.sh
write_uboot_platform "$DIR" "$(lsblk -npo PKNAME "$G_ROOTFS_DEV")"