I’m using a Quectel RM520N-GL (firmware: RM520NGLAAR03A03M4G) with a Waveshare 5G to Ethernet router, 4x4 Mimo Antenna, running on **Windows 11. I’m running into a few issues and would really appreciate clarification:
1. AT+QNETDEVCTL Command Not Working
Always returns ERROR no matter the USBNET mode.
Tried both AT+QNETDEVCTL=? and AT+QNETDEVCTL?
Is this command supported on the RM520N-GL? If so, what firmware or mode is required?
2. USBNET Modes & AT Port Access
MBIM gives data but no AT ports appear in Device Manager.
RNDIS gives partial success but unstable.
ECM shows in Device Manager but always with driver errors.
Questions:
Which mode reliably supports data + AT commands at the same time?
Is there a way to switch USBNET modes without AT access (e.g., fallback, config jumper, default)?
3. Windows Driver Issues (ECM)
I now have 3 separate Quectel ECM Adapters in Device Manager with yellow warnings.
Unable to bind any of them to a working driver.
Questions:
Are there official ECM/MBIM/RNDIS drivers for Windows from Quectel?
Any recommended uninstall/reinstall sequence to clean this up?
4. Firmware / AT Docs
Are there changelogs for A03M4G or A04M4G?
Wondering if QNETDEVCTL and USBNET behavior improved in newer versions.
If there’s a Windows tool for managing modes, drivers, or viewing port mappings — even better. Thanks in advance for any help. Happy to share logs if needed.
Dear @Jeratt
AT+QNETDEVCTL doesn’t support in RM520NGL.
For different usbnet, please install corresponding driver.
For windows driver, please download from website.
Are the USBNET modes different depending on the firmware? How can I find out which USBNET is which? When I enter AT+QCFG=“usbnet” it gives me the mode I’m in (0,1,2,3) but doesn’t tell me what those modes are (MBIM, RDNIS, DNIS, ECM).
Thank you so much, I really appreciate this. I’ve been using ChatGPT to “help” me and it changes the order on them literally every post it mentions them.
My ISP has different APN’s for different speeds. 5g APN is different from LTE. If I wanted to connect to both I would need to have the separate APN’s. At least that’s how I was understanding it, but I’m super new to this stuff so please correct me if I’m wrong.
Dear @Jeratt
You can try to configure APN via AT+QICSGP and AT+CGDCONT.
But you need to know which use on your side. It should be different PDP context.
Sorry, I did a terrible job explaining that. I tried to edit my post but the site wouldn’t let me. Right now I can only receive internet through usb for some reason but I was hoping to have it come through the ethernet cable/port instead. I can’t seem to figure how to do this. I’ve spent several hours on it at this point. I’m guessing it’s something simple but for the life of me I can’t seem to figure it out.