Linksys WRT1900ACS v1 OpenWrt Firmware

CPU: Marvell Armada 385 88F6820
RAM: 512 MB
Flash: 128NAND MB

The Linksys WRT1900ACS v1 is supported by OpenWrt on the mvebu/cortexa9 target. 4 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.

Specs

Specifications

CPU	Marvell Armada 385 88F6820
CPU cores	2
CPU frequency	1600 MHz
RAM	512 MB
Flash	128NAND MB
1 Gbit Ethernet ports	5
WLAN hardware	Marvell 88W8864
Switch	Marvell 88E6176

Hardware data from the OpenWrt Table of Hardware; verify against your unit before flashing.

Build matrix

Supported firmware versions

Distribution	Version	Target	Profile
OpenWrt	25.12.5	mvebu/cortexa9	linksys_wrt1900acs

Downloads

Download images

OpenWrt 25.12.5 · mvebu/cortexa9

Image	Type	sha256
openwrt-25.12.5-mvebu-cortexa9-linksys_wrt1900acs-targz-rootfs.tar.gz Rootfs archive for Docker / LXC containers.	rootfs	10fdf3c8d3b3…
openwrt-25.12.5-mvebu-cortexa9-linksys_wrt1900acs-squashfs-sysupgrade.bin Not sure? Pick this if upgrading from OpenWrt.	sysupgrade	cf73cfe17cb2…
openwrt-25.12.5-mvebu-cortexa9-linksys_wrt1900acs-squashfs-factory.img For first-time flash from stock firmware.	factory	9d46bbe60dbf…
openwrt-25.12.5-mvebu-cortexa9-linksys_wrt1900acs-initramfs-kernel.bin Minimal kernel image, useful for first install or recovery.	kernel	dd2e804752bb…

Downloads are served by the official OpenWrt mirrors — unchanged upstream stable builds.

Packages & install

Default packages & installation

Default packages

Every image for the Linksys WRT1900ACS v1 ships these packages by default. The customize option below lets you add or remove packages before the image is assembled.

Device packages (4)

kmod-mwlwifi wpad-basic-mbedtls mwlwifi-firmware-88w8864 kmod-dsa-mv88e6xxx

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

First install from stock firmware: flash the factoryimage through the vendor firmware's upgrade page or recovery mode.
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-linksys_wrt1900acs-targz-rootfs.tar.gz
10fdf3c8d3b34741696994e37081d6b431162e1b68a99629b973f1e995bf15b2  openwrt-25.12.5-mvebu-cortexa9-linksys_wrt1900acs-targz-rootfs.tar.gz

Build custom firmware

Need more than the default image for the Linksys WRT1900ACS v1? 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 device

More devices on mvebu/cortexa9

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.