ZyXEL WSM20: OpenWrt Compatibility Report

ZyXEL WSM20 router
Image: OpenWrt Table of Hardware, CC BY-SA 4.0

The ZyXEL WSM20 runs OpenWrt 25.12.5 on the ramips/mt7621 target, and has been supported since 23.05.0. Its WiFi 6 (AX) wireless on the mt76 driver rates good for open-source driver support (0.80/1.0), installation is rated easy, and it is no longer sold new.

Drivers: Good (0.80) WiFi 6 (AX) Install: easy

Hardware data and retail listings last checked .

Discontinued. This model is no longer sold new, so this page is kept as a reference for people who already own one. See current alternatives.

Where to buy

We have no current retail listing for the ZyXEL WSM20, which is no longer sold new. See current alternatives for devices you can still buy today.

Specifications

SoC MediaTek MT7621AT
CPU 2 cores @ 880 MHz
RAM 256 MB
Flash 128 MB (NAND)
Ethernet ports 4
WiFi generation WiFi 6 (AX)
Radios 2.4GHz: b/g/n/ax · 5GHz: a/n/ac/ax
WLAN hardware MediaTek MT7915
WLAN driver mt76
OpenWrt target ramips / mt7621
Package architecture mipsel_24kc
Current release 25.12.5
Supported since 23.05.0
Install method GUI OEM
Install difficulty easy
Power supply 12 VDC, 1.5A via barrel
Device type Home router
Estimated throughput 220 Mbps
Availability discontinued

Installing OpenWrt on the WSM20

Installation on this device is rated easy. You can flash it from the stock web interface without opening the case or using a serial cable. Documented methods: GUI OEM.

Official OpenWrt device page for the WSM20

Flashing third-party firmware can brick a router and usually voids the warranty. Always check that the firmware image matches your exact hardware version.

Still sold and well supported

Sinovoip Banana Pi BPi-R3 Mini

WiFi 6 (AX) Drivers: Excellent $109

Huasifei WH3000

WiFi 6 (AX) Drivers: Excellent

GL.iNet GL-MT6000 (Flint 2)

WiFi 6 (AX) Drivers: Excellent $170

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