IBall’s official website often lacks direct downloads for older models. Where to find IB-WRB304N_firmware.bin:
Warning: Many "firmware" files online are corrupt or for a different revision (v1 vs v2). Check PCB version inside the router. ib-wrb304n firmware update
You will see a button labeled "Browse" or "Choose File." Click this to select the firmware file you downloaded (usually ending in .bin, .img, or .pak). The Unit is Not Detected After Update: