The official firmware for the Tenda HG9 AC1200 Dual-band GPON ONT Go to product viewer dialog for this item.
https://down.tendacn.com/uploadfile/HG9/HG9_EN_V1.0.0.24.bin (example – check for newer numbers)https://down.tendacn.com/uploadfile/HG9/HG9_CN_V1.0.0.18.binIn the navigation menu, go to or System Tools , and select Firmware Upgrade .
.bin file you downloaded.