Edimax RA21S OpenWrt Firmware

CPU: MediaTek MT7621AT
RAM: 256 MB
Flash: 16 MB

The Edimax RA21S is supported by OpenWrt on the ramips/mt7621 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.

Specs

Specifications

CPU	MediaTek MT7621AT
CPU cores	2
CPU frequency	880 MHz
RAM	256 MB
Flash	16 MB
1 Gbit Ethernet ports	5
WLAN hardware	2 x MediaTek MT7615N
Switch	MediaTek MT7621AT

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	ramips/mt7621	edimax_ra21s

Downloads

Download images

OpenWrt 25.12.5 · ramips/mt7621

Image	Type	sha256
openwrt-25.12.5-ramips-mt7621-edimax_ra21s-squashfs-sysupgrade.bin Not sure? Pick this if upgrading from OpenWrt.	sysupgrade	0046643b9ce7…
openwrt-25.12.5-ramips-mt7621-edimax_ra21s-squashfs-factory.bin For first-time flash from stock firmware.	factory	28d06b5c36d8…
openwrt-25.12.5-ramips-mt7621-edimax_ra21s-initramfs-kernel.bin Minimal kernel image, useful for first install or recovery.	kernel	a0f8f3a387d9…

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

Packages & install

Default packages & installation

Default packages

Every image for the Edimax RA21S ships these packages by default. The customize option below lets you add or remove packages before the image is assembled.

Device packages (2)

kmod-mt7615-firmware -uboot-envtools

Target default packages (29)

apk-mbedtls base-files ca-bundle dnsmasq dropbear firewall4 fstools kmod-crypto-hw-eip93 kmod-gpio-button-hotplug kmod-leds-gpio 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 wpad-basic-mbedtls

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-ramips-mt7621-edimax_ra21s-squashfs-sysupgrade.bin
0046643b9ce736569d71e90554f07b02ec79d5a0edc66dbc27b89ab08fe8324b  openwrt-25.12.5-ramips-mt7621-edimax_ra21s-squashfs-sysupgrade.bin

Build custom firmware

Need more than the default image for the Edimax RA21S? 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 Edimax devices

More devices on ramips/mt7621

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.