Buffalo LinkStation LS421DE OpenWrt Firmware
The Buffalo LinkStation LS421DE is supported by OpenWrt on the mvebu/cortexa9 target. 3 firmware images are available from the official OpenWrt 25.12.5 stable release — download one below, or build a custom OpenWrt image for this device with your own package selection.
Build matrix
Supported firmware versions
| Distribution | Version | Target | Profile |
|---|---|---|---|
| OpenWrt | 25.12.5 | mvebu/cortexa9 | buffalo_ls421de |
Downloads
Download images
OpenWrt 25.12.5 · mvebu/cortexa9
| Image | Type | sha256 |
|---|---|---|
| openwrt-25.12.5-mvebu-cortexa9-buffalo_ls421de-initramfs-kernel.bin Minimal kernel image, useful for first install or recovery. | kernel | c17fe05ed567… |
| openwrt-25.12.5-mvebu-cortexa9-buffalo_ls421de-targz-rootfs.tar.gz Rootfs archive for Docker / LXC containers. | rootfs | cbb6e171b2bc… |
| openwrt-25.12.5-mvebu-cortexa9-buffalo_ls421de-squashfs-sysupgrade.bin Not sure? Pick this if upgrading from OpenWrt. | sysupgrade | ec811ee7b0c5… |
Downloads are served by the official OpenWrt mirrors — unchanged upstream stable builds.
Packages & install
Default packages & installation
Default packages
Every image for the Buffalo LinkStation LS421DE ships these packages by default. The customize option below lets you add or remove packages before the image is assembled.
Device packages (12)
kmod-rtc-rs5c372a kmod-hwmon-gpiofan kmod-hwmon-drivetemp kmod-usb-xhci-pci-renesas kmod-linkstation-poweroff kmod-md-raid0 kmod-md-raid1 kmod-md-mod kmod-fs-xfs mkf2fs e2fsprogs partx-utils
Target default packages (26)
apk-mbedtls base-files ca-bundle dnsmasq dropbear firewall4 fstools kmod-gpio-button-hotplug kmod-nft-offload libc libgcc libustream-mbedtls logd mtd netifd nftables odhcp6c odhcpd-ipv6only ppp ppp-mod-pppoe procd-ujail uboot-envtools uci uclient-fetch urandom-seed urngd
Installation notes
- Already running OpenWrt or ImmortalWrt: flash the sysupgrade image from LuCI (System → Backup / Flash Firmware) or with the sysupgrade command.
- The kernel / initramfs image boots from RAM without writing to flash — useful for a first install or for recovering from a failed flash.
- Verify your download against the published checksum before flashing:
$ sha256sum openwrt-25.12.5-mvebu-cortexa9-buffalo_ls421de-initramfs-kernel.bin c17fe05ed567291e7b3d74344764fef2bba794fc6bb24807fc6da454027c32a5 openwrt-25.12.5-mvebu-cortexa9-buffalo_ls421de-initramfs-kernel.bin
Build custom firmware
Need more than the default image for the Buffalo LinkStation LS421DE? Pick your packages — LuCI apps, themes, VPN clients — set the basics, and get a ready-to-flash OpenWrt image assembled from official packages in minutes.
Customize firmware for this deviceRelated
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More Buffalo devices
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Upstream
Upstream & source
Images are assembled from packages compiled and published by the upstream OpenWrt and ImmortalWrt projects. The complete corresponding source code is available from those projects under the GPL.