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Firmware

Set the version once and reuse it across all commands:

set -x VERSION 25.12.3

Build

Build a custom image with all required packages pre-installed:

task firmware

The image is saved to firmware/.

Bootstrap

Flash the image to a MicroSD card (the image is gzipped, pipe through zcat):

zcat firmware/openwrt-$VERSION-rockchip-armv8-friendlyarm_nanopi-r6s-ext4-sysupgrade.img.gz \
  | sudo dd of=/dev/mmcblk0 bs=4M status=progress conv=fsync

Insert the MicroSD card, boot the router, then run task apply.

Upgrade

Copy the image to the router and run sysupgrade:

scp firmware/openwrt-$VERSION-rockchip-armv8-friendlyarm_nanopi-r6s-ext4-sysupgrade.img.gz \
  root@router:/tmp/
ssh root@router "sysupgrade /tmp/openwrt-$VERSION-rockchip-armv8-friendlyarm_nanopi-r6s-ext4-sysupgrade.img.gz"

The router reboots and restores its configuration automatically. Run task apply afterwards to verify no drift.