ZTE suggests migrating to the ZXHN H288A V1.2 . How to Find Updates
Click "Browse," select your downloaded file, and click Upgrade . zxhn h267a v10 firmware update link
If there is a critical vulnerability, your ISP pushes the update silently via TR-069 at 3:00 AM. You never see the link. If the ISP has stopped supporting the device (likely, as the H267A is an older VDSL/GPON model), no update exists because the device is End-of-Life. ZTE suggests migrating to the ZXHN H288A V1