Typically found under Maintenance > Firmware Upgrade or System Tools > Software Upgrade .
Advanced users may use a TFTP server to push firmware patches via Telnet commands (e.g., load pack by tftp ). Critical Safety Warnings [OpenWrt Wiki] Huawei EchoLife EG8141A5
The EG8141A5 is a marvel of hardware: a GPON ONT with a 1.6GHz CPU, 256MB RAM, and gigabit Wi-Fi. But its locked-down update policy leaves known vulnerabilities unpatched. For instance, a 2023 exploit allowed remote command injection via the Ping diagnostic tool. An exclusive, hard-to-get firmware update is the only fix—but most users will never receive it.