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 were unable tocouldn’t confirm this — as it had nothadn’t been tested in-house.

We have now testedcompleted this setup,testing and we can confirm:

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

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???? What You NeedRequirements

• 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 integration)Z-Wave host)

• AccessNetwork access to the SLZB-MR1U'sMR1U IP address on your local network

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???? Why SLZB-OS v3.0.0?

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

• ✅ Fix forResolves USB passthrough stabilityinstability

• 
  ✅ Fix forFixes EFR32 firmware update failures (Thread radio)

• 
  ???? GeneralImproves improvements foroverall SLZB-MR1U reliability

You

can

Itupdate is the recommended version for using external USB devices with MR1U.

???? Update options:via:

• OTA (if available), or

• Manual update via USB-C usingand theour Web Flasher:
  ???? https://smlight.tech/flasher/#SLZB-06U-MRxU

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???? Setup Instructions

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

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

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

4. ConfigureSet the serial port:port to:

   
   

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

5. Save settings and restart Z-Wavethe JS UIservice

6. Pair your Z-Wave devices as usual

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⚠️ Notes and& Best Practices

• Only one USB device is supported at athe time (multi-USB support is in development)moment

• MakeMulti-device sureUSB support is under development

• Ensure port 8638 is accessible on your networkLAN

• Avoid running USBusing passthrough whileand EFR32 firmware flashing EFR32simultaneously (Thread)just — even though the issue is resolved, it'sas a goodbest practice to keep those tasks separatepractice)

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❓ Troubleshooting