SLZB-xxU and ZWA-2

✅ Using ZWA-2 Z-Wave Dongle with SLZB-MR1U via USB Passthrough

Overview

Many users asked whether the ZWA-2 Z-Wave USB stick can be used with the SLZB-MR1U using its USB passthrough over Ethernet feature.

Until recently, we couldn’t confirm, as it hadn’t been tested in-house.

We have now completed testing and can confirm:

✅ ZWA-2 works with SLZB-MR1U using USB passthrough.

Requirements

• SLZB-MR1U hardware

• SLZB-OS firmware v3.0.0 or newer

• ZWA-2 USB Z-Wave stick

• Z-Wave JS UI (or other TCP-compatible Z-Wave host)

• Network access to the SLZB-MR1U IP address

Why SLZB-OS v3.0.0?

Firmware v3.0.0 (released 29 August 2025) is required because it:

✅ Resolves USB passthrough instability
✅ Fixes EFR32 firmware update failures
✅ Improves overall SLZB-MR1U reliability

You can update via:

• OTA (if available)

• Manual update via USB-C and our Web Flasher:
  ➡️ https://smlight.tech/flasher/#SLZB-06U-MRxU

Setup Instructions

1. Flash SLZB-MR1U with SLZB-OS v3.0.0

2. Enable USB passthrough option (Go to http://slzb-mr1u.local/usb)

    

   

3. Plug the ZWA-2 USB stick into the USB-A port - right out of the box.

4. Open Z-Wave JS UI on your smart home host

5. Go to Settings -> Z-Wave -> Serial port and Set the serial port to:

   tcp://<SLZB-MR1U-IP>:8638 where <SLZB-MR1U-IP> is an actual IP address of your SLZB-MR1 in your network.

6. Save settings and restart the service, if asked.

   

7. Pair Z-Wave devices as usual (we did it via Z-Wave integration).

⚠️ Notes & Best Practices

• One USB device is supported at the moment via USB passthorugh.

• Ensure port 8638 is accessible on your LAN
  

Troubleshooting