Many users complain that the NR5103E’s "bridge mode" is broken in stock V1.0(AC.3). The 39Link39 exclusive addresses the VLAN tagging issues, allowing the router to function as a pure modem for a high-end firewall (like pfSense or OPNSense).
While specific strings like "39link39" do not correspond to official Zyxel versioning, firmware for this device is typically categorized by its origin: Carrier-Specific (e.g., Three) Generic (Zyxel Global) Current Firmware Overview Three UK/Ireland Variants : Updates for these units are usually delivered via Over-the-Air (OTA) zyxel nr5103e firmware update 39link39 exclusive
