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 —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.
Requirements
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SLZB-MR1U hardware
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SLZB-OS firmware v3.0.0 or newer
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ZWA-2 USB Z-Wave stick
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Z-Wave JS UI (or other TCP-compatible Z-Wave host)
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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:
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OTA (if available)
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Manual update via USB-C and our Web Flasher:
???? https://smlight.tech/flasher/#SLZB-06U-MRxU
Setup Instructions
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Flash SLZB-MR1U with SLZB-OS v3.0.0
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Plug the ZWA-2 USB stick into the USB-A port
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Open Z-Wave JS UI on your smart home host
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Set the serial port to:
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Save settings and restart the service
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Pair Z-Wave devices as usual
⚠️ Notes & Best Practices
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Only one USB device is supported at the moment
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Multi-device USB support is under development
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Ensure port 8638 is accessible on your LAN
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Avoid using passthrough and EFR32 firmware flashing simultaneously (just as a best practice)
Troubleshooting
Problem | Solution |
---|---|
ZWA-2 not detected | Confirm IP and port, check firmware is v3.0.0 or newer |
Devices won’t pair | Restart Z-Wave JS UI after configuring the serial port |
Unstable USB connection | Use a shorter or higher-quality USB cable (or powered USB hub) |