Upgrade if you rely on 5G stability or IPv6. Hold off if you use custom VPN tunnels (OpenVPN performance appears slightly degraded in v.2).
If your NR5103E is locked to an ISP (Three, EE, T-Mobile), check their portal first. Generic Zyxel firmware may fail signature checks.
Let me know your experience in the comments – has the latest update broken your custom APN settings? Title: Zyxel NR5103E Firmware v1.00(ABUV.2)C0 is rolling out 📡 zyxel nr5103e firmware
Title: Zyxel NR5103E Firmware Update: What’s New, Bug Fixes, and How to Update Safely
The Zyxel NR5103E remains a popular choice for 5G broadband enthusiasts and business users thanks to its 3.6 Gbps speeds and Ethernet WAN port. However, like any advanced router, performance heavily depends on the firmware version you’re running. Upgrade if you rely on 5G stability or IPv6
192.168.1.1 > Maintenance > Firmware.
✅ 5G → 4G dropouts reduced ✅ IPv6 Prefix Delegation fixed (good for downstream routers) ✅ Security patch applied Generic Zyxel firmware may fail signature checks
⚠️ Cannot downgrade after install ⚠️ OpenVPN throughput looks slower
Recently, Zyxel has been rolling out incremental updates (moving beyond the launch V1.00(ABUV.0)C0). Here is the current state of play regarding the latest releases.