BrosTrend USB wifi dongle, supported ? rtl88x2bu


I was searching for a wifi dongle that seems supported by linux. Thus I found the BrosTrend AC1200 usb dongle (model AC3L).

It looks like it should run with the rtl8812au driver, so I installed the kmod-rtl8812au-ct package via opkg.

After inserting the dongle, dmesg shows me the following:

[  443.527071] usb 1-1.3: new high-speed USB device number 5 using dwc_otg
[  443.636240] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=b812, bcdDevice= 2.10
[  443.648980] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  443.658365] usb 1-1.3: Product: 802.11ac NIC
[  443.664087] usb 1-1.3: Manufacturer: Realtek
[  443.669786] usb 1-1.3: SerialNumber: 123456

Doesn't that mean that the dongle is correctly detected? I am running OpenWrt 21.02.

Any hints what needs to be done to get that thing working?

Best regards


Try to install kmod-rtl8812au-ct, and reconnect the adapter.

What's the use case ?

I did install that but I don't see the adapter under Network -> Wireless

Use case: The wifi dongle will be used in client mode, the openwrt router in question will connect itself to an existing wlan.

It won't pop up there, automagically.

You have to create a new interface.

ah ok. If I do so, via luci web interface, I don't see a new device that I could use to setup the new interface...

or how should I add the new interface?

on another router with anoter wifi dongle I have the settings in /etc/config/wireless

config wifi-device 'radio0'
	option type 'mac80211'
	option channel '11'
	option hwmode '11g'
	option path 'platform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.0'

but how could I find out the option path parameter?

(19.07 screenshot)


agree for step one, then:

in the Device drop down, I don't have a new device for the wifi dongle...

then it's still not detected by the OS, incorrect kmod perhaps.

what does lsusb say about it ?

lsusb says:

Bus 001 Device 004: ID 7392:7811
Bus 001 Device 003: ID 0424:ec00  
Bus 001 Device 005: ID 0bda:b812 Realtek 802.11ac NIC
Bus 001 Device 002: ID 0424:9514  
Bus 001 Device 001: ID 1d6b:0002 ...

seems to be there

That just shows the device has been enumerated on the USB bus, it doesn't mean there is a driver attached. There should be additional log messages from the driver after the initial enumeration.


(good luck with that)

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I downloaded the driver for debian:

and it looks like the source code is included. Is there a way to cross compile it for openwrt?

this might be useful About rtl8812bu driver (Cannot find on package database) - #24 by _jason

search the forum for rtl88x2bu

if I were you, I'd just return it, and get something MT-based, risk/chance if it working is a lot higher

you are absolutely right, I already packed it for return... It's just too much hassle

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good call :slight_smile:

I got this from Amazon a while back - , it's on the github list of devices, posted earlier.

Installed kmod-mt76x2u, which pulled a lot of dependencies, and I was good to go.

No problem setting up an AP, and connecting to it.
Didn't do any deeper tests though, saw it come up, and I was able to connect.

Used openwrt 21.02.1.

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