Navigate to Settings and Tools > Firmware Update . Under "ESP32 OTA Update," click Check for updates and then Flash if a new version is available.

The SLZB-06 has a second chip (ESP32 or similar) that handles Ethernet, Wi-Fi, and the Web UI. This is often called the "Gateway Firmware."

If you use the SLZB-06 over , the ESP32 firmware is critical. It handles the network stack, mDNS discovery, and the web configuration panel. If this firmware is outdated, you might experience:

Controls the actual Zigbee radio (CC2652P or EFR32MG21) and its communication protocols. How to Update Your Firmware SLZB-06 Firmware - Hardware - Home Assistant Community