1. Go to the ZyXEL global website and select Powerline and Coax Adapters under PRODUCTS &SERVICES.
2. Select your powerline model.
3. Select Software as the screen shows below.
4. Download PLA5206_FW_upgrade_tool_22.214.171.124.0306 (Windows).
5. PLA5206 FW upgrade tool 126.96.36.199.0306 is a zipped file.
6. Extract the .zip file (PLA5206 FW upgrade tool 188.8.131.52.0306) and click Windows 64 bit > Setupx64.
7. After you install the PLA5206 FW upgrade tool 184.108.40.206.0306, the following screen displays. Press Scan and then Browse.
8. Find and select the downloaded PLA5206 HWB0 V3.18 rev10417_duna_B0_no_diag.ggl under PLA5206_FW_upgrade_tool_220.127.116.11.0306 (Windows) > Firmwares.
9. Select the PLA on which you want to install new firmware. Then press the Start button. Wait for 60 seconds.
The message "Upgrade successful" shows if the firmware is installed successfully.