This occurs if you try to upload a compressed archive (like a .zip or .rar file). Make sure to extract the archive first to get the raw .bin firmware file.
Most ISPs (such as Vodafone, Wind Tre, Orange, or local fiber providers) use a remote management protocol called TR-069. Your provider automatically pushes firmware updates to your router overnight. These builds contain specific configurations required for your ISP's VoIP, IPTV, and connection protocols. 2. ZTE Retail/Generic Firmware zxhn h267a v10 firmware update link