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 reliably with SLZB-MR1U using USB passthrough.

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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

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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

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Setup Instructions

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

2. Plug the ZWA-2 USB stick into the USB-A port

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

4. Set the serial port to:

   
   

   tcp://<SLZB-MR1U-IP>:8638

5. Save settings and restart the service

6. Pair Z-Wave devices as usual

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⚠️ Notes & Best Practices

• Only one USB device is supported at the moment

• Multi-device USB support is under development

• Ensure port 8638 is accessible on your LAN

• Avoid using passthrough and EFR32 firmware flashing simultaneously (just as a best practice)

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Troubleshooting