Be certain to match the firmware version to your hardware revision (e.g., F3 v3.0 or v4.0). For hardware version 3.0, the latest releases include version V12.01.01.55 . Step-by-Step Installation Guide Download Center - Tenda Global
For internet-connected devices: every 6 months. For isolated industrial controllers: only if you experience bugs or need new features. Do not update a stable production machine without a rollback plan. v7tf3-16 firmware download