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 Flash SLZB-MR1U with SLZB-OS v3.0.0 Enable USB passthrough option (Go to http://slzb-mr1u.local/usb )   Plug the ZWA-2 USB stick into the USB-A port - right out of the box. Open Z-Wave JS UI on your smart home host Go to Settings -> Z-Wave -> Serial port and Set the serial port to: tcp: //:8638 where  is an actual IP address of your SLZB-MR1 in your network. Save settings and restart the service, if asked. 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 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)