yes open-hardware router ASUS ASUS RT-N66U ASUS RT-N66U

ASUS RT-N66U (B1/B2)

Router · ASUS

Yes

Difficulty

Hard

Brick risk

High

Legal risk

Medium

High brick risk. A bad flash, unlock, or downgrade can permanently disable the device. Read the specialist guide for this exact model and firmware before you touch it.

How-to

How to

Flash OpenWrt (or Asuswrt-Merlin) via vendor web UI, TFTP or serial per the OpenWrt Table of Hardware page

Follow the specialist sources linked on this page. If this path is a jailbreak, unlock, or flash, the specialist wiki is the how-to — we do not copy those steps here.

Notes

OpenWrt current release 24.10.4, target bcm47xx.

OpenWrt unsupported functions: WiFi 2.4GHz partly WiFi 5GHz openwrt only sees 128MB RAM.

Asuswrt-Merlin note: Listed under "No longer supported" (legacy builds remain).

FreshTomato also lists RT-N66U B1 and C1 (a/k/a B2).

Check the exact hardware revision on the label before flashing.

SourcesLast verified Oct 22, 2026

https://openwrt.org/toh/asus/rt-n66u openwrt.org
https://www.asuswrt-merlin.net/about asuswrt-merlin.net

Author canirootit research

ASUS RT-N66U (B1/B2)

How-to

How to

Notes

SourcesLast verified Oct 22, 2026

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