Adtran SDG-841-t6 OpenWrt Firmware

Name: Adtran SDG-841-t6
Brand: Adtran

The Adtran SDG-841-t6 is supported by OpenWrt on the mediatek/mt7622 target. 2 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	mediatek/mt7622	smartrg_sdg-841-t6

Downloads

Download images

OpenWrt 25.12.5 · mediatek/mt7622

Image	Type	sha256
openwrt-25.12.5-mediatek-mt7622-smartrg_sdg-841-t6-squashfs-sysupgrade.bin Not sure? Pick this if upgrading from OpenWrt.	sysupgrade	06479850eb52…
openwrt-25.12.5-mediatek-mt7622-smartrg_sdg-841-t6-initramfs-kernel.bin Minimal kernel image, useful for first install or recovery.	kernel	99dd448bd59d…

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

Packages & install

Default packages & installation

Default packages

Every image for the Adtran SDG-841-t6 ships these packages by default. The customize option below lets you add or remove packages before the image is assembled.

Device packages (5)

e2fsprogs f2fsck mkf2fs kmod-mt7915e kmod-mt7915-firmware

Target default packages (30)

apk-mbedtls base-files ca-bundle dnsmasq dropbear firewall4 fitblk fstools kmod-gpio-button-hotplug kmod-leds-gpio kmod-mt7622-firmware 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

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-mediatek-mt7622-smartrg_sdg-841-t6-squashfs-sysupgrade.bin
06479850eb526d16de68300880d35d505b4f58d5b68f69b7fe23017c031b531d  openwrt-25.12.5-mediatek-mt7622-smartrg_sdg-841-t6-squashfs-sysupgrade.bin

Build custom firmware

Need more than the default image for the Adtran SDG-841-t6? 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 Adtran devices

More devices on mediatek/mt7622

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.